Terminal apparatus, base station apparatus, communication method and integrated circuit

ABSTRACT

There is provided a terminal apparatus configured to communicate with a base station apparatus. The terminal apparatus is configured to: receive information indicating a subframe of a first subframe set and a subframe of a second subframe set by using a higher layer signaling. The terminal apparatus is configured to, in a case that a power headroom for a predetermined subframe for a predetermined serving cell is calculated: calculate the power headroom based on a reference format by using a first set of parameters in a case that transmission in a physical uplink shared channel is not performed in the predetermined subframe for the predetermined serving cell, and the predetermined subframe belongs to the first subframe set; and calculate the power headroom based on the reference format by using a second set of parameters in a case that the transmission in the physical uplink shared channel is not performed in the predetermined subframe for the predetermined serving cell, and the predetermined subframe belongs to the second subframe set.

TECHNICAL FIELD

The present invention relates to a terminal apparatus, a base stationapparatus, a communication method, and an integrated circuit.

This application claims the benefit of Japanese Priority PatentApplication JP 2013-143426 filed Jul. 9, 2013, the entire contents ofeach of which are incorporated herein by reference.

BACKGROUND ART

A radio access method and a radio network for cellular mobilecommunication (hereinafter referred to as “Long Term Evolution (LTE)”,or “Evolved Universal Terrestrial Radio Access (EUTRA)”) are under studyin the 3rd Generation Partnership Project (3GPP). In LTE, a base stationapparatus is also referred to as an evolved NodeB (eNodeB), and aterminal apparatus is also referred to as user equipment (UE). LTE is acellular communication system in which the landscape is divided, in acellular pattern, into multiple cells, each served by a base stationapparatus. A single base station apparatus may manage multiple cells.

Here, LTE supports Time Division Duplex (TDD). LTE that employs a TDDmode is also referred to as TD-LTE or LTE TDD. TDD is a technology thatenables full duplex communication in a single frequency band bytime-multiplexing an uplink signal and a downlink signal. Furthermore,LTE supports Frequency Division Duplex (FDD).

Furthermore, application of an interference reduction technology and atraffic adaptation technology (DL-UL Interference Management and TrafficAdaptation) to TD-LTE is under study in the 3GPP. That is, the trafficadaptation technology is a technology that changes a ratio of an uplinkresource to a downlink resource according to uplink traffic and downlinktraffic. The traffic adaptation technology is also referred to as adynamic TDD.

As a method of realizing the traffic adaptation, a method of using aflexible subframe is proposed in NPL 1. The base station apparatus cantransmit a downlink signal or receive an uplink signal in the flexiblesubframe. The terminal apparatus regards the flexible subframe as adownlink subframe as long as the base station apparatus does notinstruct the terminal apparatus to transmit an uplink signal.

Furthermore, as an interference reduction technology, Transmission PowerControl (TPC) for uplink is under study in NPL 2. For example, study onparameters associated with the transmission power control for uplink isdescribed in NPL 2.

CITATION LIST Non-Patent Literature

-   NPL 1: “On standardization impact of TDD UL-DL adaptation”,    R1-122016, 3GPP TSG-RAN WG1 Meeting #69, 21-25 May 2012-   NPL 2: “UL power control based interference mitigation for eIMTA”,    R1-132351, 3GPP TSG-RAN WG1 Meeting #73, 20-24 May 2013

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

However, a specific procedure is not described that is used when theterminal apparatus performs processing associated with transmissionpower in the radio communication system. For example, a specificprocedure is not described that is used when the terminal apparatusexecutes the transmission power control. Furthermore, for example, aspecific procedure is not described when the terminal apparatus executesPower Headroom Reporting (PHR).

The present invention has been made in view of the foregoingcircumstances, and it is an object of the present invention to provide aterminal apparatus, a base station apparatus, a communication method,and an integrated circuit with which the terminal apparatus canefficiently perform a process related to a transmission power.

Means for Solving the Problems

(1) In order to achieve the aforementioned object, aspects of thepresent invention provide the following means. That is, according to anaspect of the present invention, there is provided a terminal apparatusconfigured to communicate with a base station apparatus. The terminalapparatus is configured to: receive information indicating a subframe ofa first subframe set and a subframe of a second subframe set by using ahigher layer signaling. The terminal apparatus is configured to, in acase that a power headroom for a predetermined subframe for apredetermined serving cell is calculated: calculate the power headroombased on a reference format by using a first set of parameters in a casethat transmission in a physical uplink shared channel is not performedin the predetermined subframe for the predetermined serving cell, andthe predetermined subframe belongs to the first subframe set; andcalculate the power headroom based on the reference format by using asecond set of parameters in a case that the transmission in the physicaluplink shared channel is not performed in the predetermined subframe forthe predetermined serving cell, and the predetermined subframe belongsto the second subframe set.

(2) Additionally, the terminal apparatus may be configured to, in a casethat the power headroom for the predetermined subframe for thepredetermined serving cell is calculated: calculate the power headroombased on real transmission by using the first set of parameters in acase that the transmission in the physical uplink shared channel isperformed in the predetermined subframe for the predetermined servingcell, and the predetermined subframe belongs to the first subframe set;and calculate the power headroom based on the real transmission by usingthe second set of parameters in a case that the transmission in thephysical uplink shared channel is performed in the predeterminedsubframe for the predetermined serving cell, and the predeterminedsubframe belongs to the second subframe set.

(3) Further, the terminal apparatus may be configured to: receiveinformation indicating a first uplink-downlink configuration andinformation indicating a second uplink-downlink configuration; adjusttransmission in a physical uplink shared channel corresponding to aphysical downlink control channel detected in a subframe n to be asubframe n+k based on k given by the first uplink-downlinkconfiguration; and not perform transmission in the physical uplinkshared channel adjusted in the subframe n+k in a case that the subframen+k is indicated as a downlink subframe by the second uplink-downlinkconfiguration.

(4) Moreover, according to an aspect of the present invention, there isprovided a base station apparatus configured to communicate with aterminal apparatus, the base station apparatus being configured to:transmit information indicating a subframe of a first subframe set and asubframe of a second subframe set by using a higher layer signaling; andreceive a power headroom for a predetermined subframe for apredetermined serving cell. The power headroom is calculated based on areference format by using a first set of parameters in a case thattransmission in a physical uplink shared channel is not performed in thepredetermined subframe for the predetermined serving cell, and thepredetermined subframe belongs to the first subframe set. The powerheadroom is calculated based on the reference format by using a secondset of parameters in a case that the transmission in the physical uplinkshared channel is not performed in the predetermined subframe for thepredetermined serving cell, and the predetermined subframe belongs tothe second subframe set.

(5) Additionally, the power headroom may be calculated based on realtransmission by using the first set of parameters in a case that thetransmission in the physical uplink shared channel is performed in thepredetermined subframe for the predetermined serving cell, and thepredetermined subframe belongs to the first subframe set. The powerheadroom may be calculated based on the real transmission by using thesecond set of parameters in a case that the transmission in the physicaluplink shared channel is performed in the predetermined subframe for thepredetermined serving cell, and the predetermined subframe belongs tothe second subframe set.

(6) Further, the base station apparatus may be configured to: transmitinformation indicating a first uplink-downlink configuration andinformation indicating a second uplink-downlink configuration; receive aphysical uplink shared channel corresponding to a physical downlinkcontrol channel detected in a subframe n in a subframe n+k based on kgiven by the first uplink-downlink configuration; and not performreception in the physical uplink shared channel adjusted in the subframen+k in a case that the subframe n+k is indicated as a downlink subframeby the second uplink-downlink configuration.

(7) According to an aspect of the present invention, there is provided acommunication method to be used in a terminal apparatus configured tocommunicate with a base station apparatus. The method includes:receiving information indicating a subframe of a first subframe set anda subframe of a second subframe set by using a higher layer signaling.The communication method further includes, in a case that a powerheadroom for a predetermined subframe for a predetermined serving cellis calculated: calculating the power headroom based on a referenceformat by using a first set of parameters in a case that transmission ina physical uplink shared channel is not performed in the predeterminedsubframe for the predetermined serving cell, and the predeterminedsubframe belongs to the first subframe set; and calculating the powerheadroom based on the reference format by using a second set ofparameters in a case that the transmission in the physical uplink sharedchannel is not performed in the predetermined subframe for thepredetermined serving cell, and the predetermined subframe belongs tothe second subframe set.

(8) According to an aspect of the present invention, there is provided acommunication method to be used in a base station apparatus configuredto communicate with a terminal apparatus. The method includes:transmitting information indicating a subframe of a first subframe setand a subframe of a second subframe set by using a higher layersignaling; and receiving a power headroom for a predetermined subframefor a predetermined serving cell. The power headroom is calculated basedon a reference format by using a first of parameters in a case thattransmission in a physical uplink shared channel is not performed in thepredetermined subframe for the predetermined serving cell, and thepredetermined subframe belongs to the first subframe set. The powerheadroom is calculated based on the reference format by using a secondset of parameters in a case that the transmission in the physical uplinkshared channel is not performed in the predetermined subframe for thepredetermined serving cell, and the predetermined subframe belongs tothe second subframe set.

(9) According to an aspect of the present invention, there is providedan integrated circuit to be mounted on a terminal apparatus configuredto communicate with a base station apparatus. The integrated circuit isconfigured to: receive information indicating a subframe of a firstsubframe set and a subframe of a second subframe set by using a higherlayer signaling. The integrated circuit is configured to, in a case thata power headroom for a predetermined subframe for a predeterminedserving cell is calculated: calculate the power headroom based on areference format by using a first set of parameters in a case thattransmission in a physical uplink shared channel is not performed in thepredetermined subframe for the predetermined serving cell, and thepredetermined subframe belongs to the first subframe set; and calculatethe power headroom based on the reference format by using a second setof parameters in a case that the transmission in the physical uplinkshared channel is not performed in the predetermined subframe for thepredetermined serving cell, and the predetermined subframe belongs tothe second subframe set.

(10) According to an aspect of the present invention, there is providedan integrated circuit to be mounted on a base station apparatusconfigured to communicate with a terminal apparatus. The integratedcircuit is configured to: transmit information indicating a subframe ofa first subframe set and a subframe of a second subframe set by using ahigher layer signaling; and receive a power headroom for a predeterminedsubframe for a predetermined serving cell. The power headroom iscalculated based on a reference format by using a first set ofparameters in a case that transmission in a physical uplink sharedchannel is not performed in the predetermined subframe for thepredetermined serving cell, and the predetermined subframe belongs tothe first subframe set. The power headroom is calculated based on thereference format by using a second set of parameters in a case that thetransmission in the physical uplink shared channel is not performed inthe predetermined subframe for the predetermined serving cell, and thepredetermined subframe belongs to the second subframe set.

Effects of the Invention

According to an embodiment of the present invention, a terminalapparatus can efficiently execute processing associated withtransmission power.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of a radio communicationsystem.

FIG. 2 is a diagram illustrating a configuration example of a radioframe.

FIG. 3 is a diagram illustrating a configuration example of a slot.

FIG. 4 is a diagram illustrating an example of a mapping between aphysical channel and a physical signal in a downlink subframe.

FIG. 5 is a diagram illustrating an example of a mapping between aphysical channel and a physical signal in an uplink subframe.

FIG. 6 is a diagram illustrating an example of a mapping between aphysical channel and a physical signal in a special subframe.

FIG. 7 is a schematic block diagram illustrating a terminal apparatus 1.

FIG. 8 is a schematic block diagram illustrating a base stationapparatus 3.

FIG. 9 is a table illustrating an example of an uplink-downlinkconfiguration.

FIG. 10 is a flowchart illustrating a method of setting a firstconfiguration and a second configuration.

FIG. 11 is a diagram illustrating a relationship between a subframe thatis designated by a first configuration and a subframe that is designatedby a second configuration.

FIG. 12 is a diagram illustrating an example of a correspondence betweena subframe n in which a PDCCH/EPDCCH/PHICH is arranged and a subframen+k in which a PUSCH that the PDCCH/EPDCCH/PHICH corresponds to isarranged.

FIG. 13 is a diagram illustrating an example of a correspondence betweenthe subframe n in which a PHICH is arranged and a subframe n+k in whichthe PUSCH that the PHICH corresponds to is arranged.

FIG. 14 is a diagram illustrating an example of a correspondence betweenthe subframe n in which a PUSCH is arranged, and the subframe n+k inwhich a PHICH that the PUSCH corresponds to is arranged.

FIG. 15 is a diagram illustrating an example of a correspondence betweena subframe n−k in which a PDSCH is arranged and the subframe n in whicha HARQ-ACK that the PDSCH corresponds to is transmitted.

FIG. 16 is a diagram illustrating one configuration example of asubframe set.

FIG. 17 is a diagram illustrating an example of a structure of a MAC CEthat is used in reporting a power headroom.

FIG. 18 is a diagram illustrating an example of a power headroom beingreported and a corresponding power headroom level.

MODE FOR CARRYING OUT THE INVENTION

The present embodiment is applicable to a single cell that is set toserve a terminal apparatus. Furthermore, the present embodiment may beapplicable to each of multiple cells that are set to serve theequipment. Furthermore, the present embodiment may be applicable to someof multiple cells that are set to serve the equipment. Here, atechnology in which the terminal apparatus performs communication inmultiple cells is called a cell aggregation or a carrier application.Here, a cell that is set to serve the equipment is also called a servingcell.

Here, one primary cell and one or more secondary cells are included inthe multiple cells that are set to serve the equipment. The primary cellmay include a cell on which an initial connection establishmentprocedure is performed. Furthermore, the primary cell may include a cellthat is instructed to serve as a primary cell in a handover procedure.Furthermore, at the time when a radio resource control (RRC) connectionis established or after the RRC connection is established, the secondarycell may be set.

Furthermore, the secondary cell may be activated based on informationthat is transmitted from a base station apparatus. The primary cell maybe always activated.

In a radio communication system according to the present embodiment, atleast, a Time Division Duplex (TDD) mode is applied (supported).Furthermore, in a case where the cell aggregation is applied, the TDDmode may be applied in each of the multiple cells. Furthermore, in acase where a cell to which the TDD mode is applied and a cell to which aFrequency Division Duplex (FDD) mode is applied are aggregated, thepresent embodiment may be applied to the cell to which the TDD mode isapplied.

Furthermore, the present embodiment may be applied to the terminalapparatus, to which the base station apparatus sets a dynamic TDD(setting relating to the dynamic TDD (or a transmission mode)) to beapplied.

According to the present embodiment, “X/Y” includes the meaning of “X orY”. According to the present embodiment, “X/Y” includes the meaning of“X and Y”. According to the present embodiment, “X/Y” includes themeaning of “X and/or Y”.

FIG. 1 is a diagram illustrating an example of the radio communicationsystem according to the present embodiment. As illustrated in FIG. 1,the radio communication system includes terminal apparatuses 1A to 1Cand a base station apparatus 3. The terminal apparatuses 1A to 1C arealso referred to below as a terminal apparatus 1.

In FIG. 1, uplink physical channels that are used in radio communicationfor uplink from the terminal apparatus 1 to the base station apparatus 3are as follows. The uplink physical channel is used to transmitinformation that is output from a higher layer.

Physical Uplink Control Channel (PUCCH)

Physical Uplink Shared Channel (PUSCH)

Physical Random Access Channel (PRACH)

The PUCCH is used to transmit Uplink Control Information (UCI). At thispoint, the uplink control information includes a positiveacknowledgement (ACK) or a negative acknowledgement (NACK) (ACK/NACK) ofdownlink data (downlink transport block, Downlink-Shared Channel(DL-SCH)). The ACK/NACK with respect to the downlink data is also calledHARQ-ACK or HARQ feedback.

Furthermore, the uplink control information includes Channel StateInformation (CSI) for downlink. Furthermore, the uplink controlinformation includes a Scheduling Request (SR) that is used forrequesting Uplink-Shared channel (UL-SCH) resources.

The PUSCH is used to transmit uplink data (uplink transport block,UL-SCH). Furthermore, the PUSCH may be used to transmit the ACK/NACKand/or the channel state information, along with the uplink data.Furthermore, the PUSCH may be used to transmit only the uplink controlinformation.

Furthermore, the PUSCH is used to transmit an RRC message. The RRCmessage is a piece of information/signal that is processed in a RadioResource Control (RRC) layer. Furthermore, the PUSCH is used to transmita MAC control element (CE). Here, the MAC CE is a piece ofinformation/signal that is processed in a Medium Access Control (MAC)layer.

For example, a power headroom may be included in the MAC CE and may bereported through the PUSCH. That is, a MAC CE field may be used toindicate a power headroom level.

The PRACH is used to transmit a random access preamble.

Furthermore, in the radio communication for uplink, an Uplink ReferenceSignal (UL RS) is used as an uplink physical signal. The uplink physicalsignal is not used to transmit information that is output from a higherlayer, but is used by a physical layer. Here, a Demodulation ReferenceSignal (DMRS) and a Sounding Reference Signal (SRS) are included in theuplink reference signal.

The DMRS is associated with transmission on the PUSCH or the PUCCH. Forexample, the base station apparatus 3 uses the DMRS to perform channelreconfiguration of the PUSCH or the PUCCH. The SRS is not associatedwith transmission on the PUSCH or the PUCCH. For example, the basestation apparatus 3 uses the SRS to measure an uplink channel state.

In FIG. 1, downlink physical channels that are used in the radiocommunication for downlink from the base station apparatus 3 to theterminal apparatus 1 are as follows. The downlink physical channel isused to transmit information that is output from a higher layer.

Physical Broadcast Channel (PBCH)

Physical Control Format Indicator Channel (PCFICH)

Physical Hybrid automatic repeat request Indicator Channel (PHICH)

Physical Downlink Control Channel (PDCCH)

Enhanced Physical Downlink Control Channel (EPDCCH)

Physical Downlink Shared Channel (PDSCH)

The PBCH is used to broadcast a Master Information Block (MIB)(Broadcast Channel (BCH)) that is used in common in the terminalapparatus 1. The PCFICH is used to transmit information that designatesa domain (for example, the number of OFDM symbols) that is used intransmission on the PDCCH.

The PHICH is used to transmit the ACK/NACK with respect to the uplinkdata that the base station apparatus 3 receives. That is, the PHICH isused to transmit an HARQ indicator (HARQ feedback) that indicates theACK/NACK with respect to the uplink data.

The PDCCH and the EPDCCH are used to transmit Downlink ControlInformation (DCI). Here, multiple DCI formats are defined fortransmission of the downlink control information. That is, a field forthe downlink control information is defined in the DCI format and ismapped to information bit.

For example, a DCI format 1A that is used for scheduling of one PDSCH(transmission of one downlink transport block) in one cell is defined asthe DCI format for the downlink.

For example, information relating to PDSCH resource allocation,information relating to a Modulation and Coding Scheme (MCS) for thePDSCH, and the downlink control information such as a TPC command forthe PUCCH are included in the DCI format for the downlink. Here, the DCIformat for the downlink is also referred to as a downlink grant (or adownlink assignment).

For example, a DCI format 0 that is used for scheduling of one PUSCH(transmission of one uplink transport block) in one cell is defined asthe DCI format for the uplink.

For example, information relating to PUSCH resource allocation,information relating to the MCS for the PUSCH, and the downlink controlinformation such as the TPC command for the PUSCH are included in theDCI format for the downlink. The DCI format for the uplink is alsoreferred to as an uplink grant (or an uplink assignment).

In a case where a PDSCH resource is scheduled using the downlinkassignment, the terminal apparatus 1 receives the downlink data, on thescheduled PDSCH. Further, in a case where a PUSCH resource is scheduledusing the uplink grant, the terminal apparatus 1 transmits the uplinkdata and/or the uplink control information, on the scheduled PUSCH.

The PDSCH is used to transmit the downlink data (the downlink transportblock, DL-SCH). Furthermore, the PDSCH is used to transmit a systeminformation block type-1 message. The system information block type-1message is cell-specific (specific to a cell) information.

Furthermore, the PDSCH is used to transmit a system information message.The system information message includes a system information block Xother than the system information block type-1. The system informationmessage is cell-specific (specific to a cell) information.

Furthermore, the PDSCH is used to transmit the RRC message. Here, theRRC message that is transmitted from the base station apparatus 3 may becommon to the multiple terminal apparatuses 1 with the cell.Furthermore, the RRC message that is transmitted from the base stationapparatus 3 may be a message (referred to as dedicated signaling)dedicated to a certain terminal apparatus 1. That is, userequipment-specific (specific to user equipment) information istransmitted using the message dedicated to a certain terminal apparatus1. Furthermore, the PDSCH is used to transmit the MAC CE.

Here, the RRC message and/or the MAC CE are also referred to ashigher-layer signaling.

Furthermore, in the radio communication for downlink, a Synchronizationsignal (SS) and a Downlink Reference Signal (DL RS) are used as downlinkreference signals. The downlink physical signal is not used to transmitinformation that is output from a higher layer, but is used by aphysical layer.

The synchronization signal is used in order for the terminal apparatus 1to be synchronized to a frequency domain and a time domain for downlink.Furthermore, the downlink reference signal is used in order for theterminal apparatus 1 to perform the channel reconfiguration of thedownlink physical channel. For example, the downlink reference signal isused for the terminal apparatus 1 to calculate downlink channel stateinformation.

Here, a Cell-specific Reference Signal (CRS), a UE-specific ReferenceSignal (URS) associated with the PDSCH, a Demodulation Reference Signal(DMRS) associated with the EPDCCH, a Non-Zero Power Channel StateInformation—Reference Signal (NZPCSI—RS), and a Zero Power Channel StateInformation—Reference Signal (ZP CSI—RS) are included in the downlinkreference signal.

The CRS is transmitted in an entire band for a subframe, and is used toperform demodulation of the PBCH/PDCCH/PHICH/PCFICH/PDSCH. The URSassociated with the PDSCH is transmitted in a subframe and in a bandthat are used in transmission on the PDSCH to which the URS relates, andis used to perform the demodulation of the PDSCH to which the URSrelates.

The DMRS associated with the EPDCCH is transmitted in a subframe and ina band that are used in transmission on the EPDCCH to which the DMRSrelates. The DMRS is used to perform the demodulation of the EPDCCH towhich the DMRS relates.

An NZP CSI-RS resource is set by the base station apparatus 3. Forexample, the terminal apparatus 1 performs signal measurement (channelmeasurement) using the NZP CSI-RS. A ZP CSI-RS resource is set by thebase station apparatus 3. With a zero output, the base station apparatus3 transmits the ZP CSI-RS. For example, the terminal apparatus 1performs interference measurement on a resource that the NZP CSI-RScorresponds to.

Here, the downlink physical channel and the downlink physical signal arecollectively also referred to as a downlink signal. Furthermore, theuplink physical channel and the uplink physical signal are collectivelyalso referred to as an uplink signal. Furthermore, the downlink physicalchannel and the uplink physical channel are collectively also referredto as a physical channel. Furthermore, the downlink physical signal andthe uplink physical signal are collectively also referred to as aphysical signal.

Furthermore, a BCH, a UL-SCH and a DL-SCH are transport channels. Achannel that is used in a MAC layer is referred to as a transportchannel. Furthermore, a unit of the transport channel that is used inthe MAC layer is also referred to as a Transport Block (TB), or a MACProtocol Data Unit (PDU). The transport block is a unit in which the MAClayer delivers data to the physical layer. In the physical layer, thetransport block is mapped to a codeword, and coding processing and thelike are performed for every codeword.

FIG. 2 is a diagram illustrating a configuration example of a radioframe according to the present embodiment. For example, each radio frameis 10 ms in length. Furthermore, each half frame is 5 ms in length. Eachsubframe is 1 ms in length, and is defined by two consecutive slots.Each slot is 0.5 ms in length. The i-th subframe within the radio frameis configured from the (2×i)-th slot and the (2×i+1)-th slot. To sum up,10 subframes are used at intervals of 10 ms.

According to the present embodiment, three types of subframes aredefined as follows.

A downlink subframe (first subframe)

An uplink subframe (second subframe)

A special subframe (third subframe)

The downlink subframe is a subframe reserved for downlink transmission.Furthermore, the uplink subframe is a subframe reserved for uplinktransmission. Furthermore, the special subframe is configured from threefields. The three fields are a Downlink Pilot Time Slot (DwPTS), a GuardPeriod (GP), and an Uplink Pilot Time Slot (UpPTS). A single radio frameis at least configured from the downlink subframe, the uplink subframe,and the special subframe.

A sum of lengths of the DwPTS, the GP, and the UpPTS is 1 ms. The DwPTSis a slot reserved for the downlink transmission. The UpPTS is a slotreserved for the uplink transmission. The GP is a slot in which thedownlink transmission and the uplink transmission are not performed.

Furthermore, in the radio frame, 5-ms downlink-to-uplink switch-pointperiodicity and 10-ms downlink-to-uplink switch-point periodicity aresupported.

FIG. 3 is a diagram illustrating a configuration example of a slotaccording to the present invention. The physical signal or the physicalchannel that is transmitted in each slot is expressed by a resourcegrid. In the downlink, the resource grid is defined by multiplesubcarriers and multiple OFDM symbols. In the uplink, the resource gridis defined by multiple subcarriers and multiple SC-FDMA symbols.

Here, the number of subcarriers that make up one slot depends on a cellbandwidth. Furthermore, the number of OFDM symbols or SC-FDMA symbolsthat make up one slot is 7. Furthermore, each element within theresource grid is also referred to as a resource element.

A resource block is used for expressing mapping to the resource elementof a certain physical channel (for example, the PDSCH, the PUSCH, andthe like). For example, one physical resource block is defined by sevenconsecutive OFDM symbols or SC-FDMA symbols in the time domain and 12consecutive subcarriers in the frequency domain.

FIG. 4 is a diagram illustrating an example of a mapping between thephysical channel and the physical signal in the downlink subframeaccording to the present embodiment. In the downlink subframe, the basestation apparatus 3 can transmit the downlink physical channel and thedownlink physical signal.

For example, the PBCH is transmitted only in a subframe 0 in the radioframe. Furthermore, the downlink reference signal is mapped to theresource elements that are distributed in the frequency domain and thetime domain. Here, the downlink reference signal is not illustrated inFIG. 4 for the sake of simple description.

Furthermore, multiple PDCCH's may be frequency-multiplexed or betime-multiplexed in a PDCCH domain. Furthermore, multiple EPDCCH's maybe frequency-multiplexed, be time-multiplexed, and be space-multiplexedin an EPDCCH domain. Furthermore, multiple PDSCH's may befrequency-multiplexed, and be space-multiplexed in a PDSCH domain.Furthermore, the PDCCH and, the PDSCH or the EPDCCH may betime-multiplexed. Furthermore, the PDSCH and the EPDCCH may befrequency-multiplexed.

FIG. 5 is a diagram illustrating an example of the mapping between thephysical channel and the physical signal in the uplink subframeaccording to the present embodiment. In the uplink subframe, theterminal apparatus 1 can transmit the uplink physical channel and theuplink physical signal.

For example, in the PUCCH domain, multiple PUCCH's may befrequency-multiplexed, be time-multiplexed, and be code-multiplexed.Furthermore, in the PUSCH domain, multiple PUSCH's may befrequency-multiplexed and be space-multiplexed. Furthermore, the PUCCHand the PUSCH may be frequency-multiplexed.

Furthermore, the SRS may be transmitted using the last SC-FDMA symbol inthe uplink subframe.

FIG. 6 is a diagram illustrating an example of the mapping between thephysical channel and the physical signal in the special subframeaccording to the present embodiment. In FIG. 6, the DwPTS is configuredfrom the first to tenth SC-FDMA symbols in the special subframe.Furthermore, the GP is configured from the eleventh to twelfth SC-FDMAsymbols in the special subframe. Furthermore, the UpPTS is configuredfrom the thirteenth to fourteenth SC-FDMA symbols in the specialsubframe.

The base station apparatus 3 may transmit the PCFICH, the PHICH, thePDCCH, the EPDCCH, the PDSCH, the synchronization signal, and thedownlink reference signal in the DwPTS of the special subframe.Furthermore, the base station apparatus 3 may not transmit the PBCH inthe DwPTS of the special subframe.

Furthermore, the terminal apparatus 1 may transmit the SRS in the UpPTSof the special subframe. Furthermore, the terminal apparatus 1 may nottransmit the PUCCH, the PUSCH, and the DMRS in the UpPTS of the specialsubframe.

Here, the terminal apparatus 1 monitors a set of PDCCH candidates and/ora set of EPDCCH candidates. The EPDCCH is hereinafter included in thePDCCH for the sake of simple description. Here, the PDCCH candidatesrefer to candidates for the PDCCH that have the likelihood of beingmapped or transmitted by the base station apparatus 3. Furthermore, themonitoring means that the terminal apparatus 1 attempts to decode eachof the PDCCH's within the set of PDCCH candidates, according to all theDCI formats that are monitored.

Furthermore, the set of PDCCH candidates that the terminal apparatus 1monitors is also referred to as a search space. That is, in the PDCCHdomain, a Common Search Space (CSS) and/or a user equipment-specificSearch Space (USS) are configured (defined, or set). In the CSS and/orthe USS, the terminal apparatus 1 monitors the PDCCH and detects thePDCCH destined for itself.

Furthermore, an RNTI that the base station apparatus 3 allocates to theterminal apparatus 1 is used in the transmission (transmission on thePDCCH) of the downlink control information. Specifically, a CyclicRedundancy check (CRC) parity bits are attached to the DCI format (alsopossibly to the downlink control information) and after beingattachment, the CRC parity bits are scrambled by the RNTI.

The terminal apparatus 1 attempts to decode the DCI format to which theCRC parity bits scrambled by the RNTI are attached, and detects the DCIformat that succeeds in the CRC, as the DCI format destined for itself(also called blind decoding).

Here, a Cell-Radio Network Temporary Identifier (C-RNTI) is included inthe RNTI. The C-RNTI is a unique identifier that is used for RRCconnection and identification of the scheduling. The C-RNTI is used inunicast transmission that is dynamically scheduled.

FIG. 7 is a schematic block diagram of a configuration of the terminalapparatus 1 according to the present embodiment. As illustrated in FIG.7, the terminal apparatus 1 is configured to include a higher-layerprocessing unit 101, a control unit 103, a receiving unit 105, atransmitting unit 107, a transmission power processing unit 109, and atransmit and receive antenna 111. Furthermore, the higher-layerprocessing unit 101 is configured to include a radio resource controlunit 1011, a subframe setting unit 1013, a scheduling informationinterpretation unit 1015, and a transmission power control unit 1017.Furthermore, the receiving unit 105 is configured to include a decodingunit 1051, a demodulation unit 1053, a demultiplexing unit 1055, and aradio receiving unit 1057. Furthermore, the transmitting unit 107 isconfigured to include a coding unit 1071, a modulation unit 1073, amultiplexing unit 1075, a radio transmitting unit 1077, and the uplinkreference signal generation unit 1079.

The higher-layer processing unit 101 outputs to the transmitting unit107 the uplink data (transport block) that is generated by a useroperation and the like. Furthermore, the higher-layer processing unit101 performs processing of a Medium Access Control (MAC) layer, a PacketData Convergence Protocol (PDCP) layer, a Radio Link Control (RLC)layer, and a Radio Resource Control (RRC) layer.

The radio resource control unit 1011 that the higher-layer processingunit 101 includes performs management of various pieces of settinginformation on the terminal apparatus 1 itself. Furthermore, the radioresource control unit 1011 generates information that is arranged oneach uplink channel and outputs the generated information to thetransmitting unit 107.

The subframe setting unit 1013 performs management of a firstconfiguration, a second configuration, and a third configuration. Thesubframe setting unit 1013 sets the first configuration, the secondconfiguration, and the third configuration. Furthermore, the subframesetting unit 1013 sets at least two subframes.

The scheduling information interpretation unit 1015 that thehigher-layer processing unit 101 includes interprets the DCI format(scheduling information) that is received by the receiving unit 105,generates control information for performing control of the receivingunit 105 and the transmitting unit 107 based on a result of interpretingthe DCI format, and outputs the generated control information to thecontrol unit 103.

The scheduling information interpretation unit 1015 further determines atiming at which transmitting processing and receiving processing areperformed, based on the first configuration, the second configuration,and the third configuration.

The transmission power control unit 1017 executes control for processingassociated with transmission power. The transmission power control unit1017 outputs a setting that is used to execute transmission powercontrol, to the transmission power processing unit 109. Furthermore, thetransmission power control unit 1017 instructs the transmitting unit 107to transmit the uplink signal based on the transmission power control.The transmission power control unit 1017 outputs a setting that is usedto execute power headroom reporting, to the transmission powerprocessing unit 109. Furthermore, the transmission power control unit1017 instructs the transmitting unit 107 to report the power headroom.

The control unit 103 generates a control signal for performing controlof the receiving unit 105, the transmitting unit 107 and thetransmission power processing unit 109, based on the control informationfrom the higher-layer processing unit 101. The control unit 103 outputsthe generated control signal to the receiving unit 105, the transmittingunit 107, and the transmission power processing unit 109 and performsthe control of the receiving unit 105 and the transmitting unit 107.

In accordance with the control signal that is input from the controlunit 103, the receiving unit 105 demultiplexes, demodulates, and decodesa received signal that is received from the base station apparatus 3through the transmit and receive antenna 111, and outputs the resultinginformation to the higher-layer processing unit 101.

The radio receiving unit 1057 converts (down converts) a downlink signalreceived through the transmit and receive antenna 111 into a basebandsignal by performing orthogonal demodulation, removes unnecessaryfrequency components, controls an amplification level in such a manneras to suitably maintain a signal level, performs orthogonal demodulationbased on an in-phase component and an orthogonal component of thereceived signal, and converts the resulting orthogonally-demodulatedanalog signal into a digital signal.

Furthermore, the radio receiving unit 1057 removes a portion equivalentto a guide interval (GI) from the digital signal that results from theconversion, performs fast Fourier Transform (FFT) on the signal fromwhich the guide interval is removed, and extracts a signal in thefrequency domain.

The demultiplexing unit 1055 demultiplexes the extracted signal into thePHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink referencesignal. Furthermore, the demultiplexing unit 1055 performs channelcorrection on the PHICH, the PDCCH, the EPDCCH, and the PDSCH, based onan estimated value for the channel that is acquired as a result ofmeasuring the channel.

The demodulation unit 1053 multiplies the PHICH by a corresponding codefor composition, performs demodulation in compliance with a Binary PhaseShift Keying (BPSK) modulation scheme on the resulting composite signal,and outputs a result of the demodulation to the decoding unit 1051. Thedecoding unit 1051 decodes the PHICH destined for the terminal apparatus1 itself, and outputs to the higher-layer processing unit 101 the HARQindicator that results from the decoding.

Furthermore, the demodulation unit 1053 performs demodulation incompliance with a modulation scheme such as QPSK on the PDCCH and/or theEPDCCH and outputs a result of the demodulation to the decoding unit1051. The decoding unit 1051 attempts to perform the decoding of thePDCCH and/or the EPDCCH. In a case where the decoding unit 1051succeeds, the decoding unit 1051 outputs to the higher-layer processingunit 101 the downlink control information that results from the decodingand the RNTI that the downlink control information corresponds to.

Furthermore, demodulation unit 1053 performs the demodulation on thePDSCH in compliance with the modulation scheme notified with thedownlink assignment, such as Quadrature Phase Shift Keying (QPSK), 16Quadrature Amplitude Modulation (QAM), or 64 QAM, and outputs a resultof the demodulation to the decoding unit 1051. The decoding unit 1051performs the decoding based on information relating to a coding ratethat is notified with the downlink control information, and outputs tothe higher-layer processing unit 101 the downlink data (transport block)that results from the decoding.

The transmitting unit 107 generates the uplink reference signal inaccordance with the control signal that is input from the control unit103, performs the coding and the modulation on the uplink data(transport block) that is input from the higher-layer processing unit101, multiplexes the PUCCH, the PUSCH, the generated uplink referencesignal, and transmits a result of the multiplexing to the base stationapparatus 3 through the transmit and receive antenna 111.

The coding unit 1071 performs the coding, such as convolutional codingand block coding, on the uplink control information that is input fromthe higher-layer processing unit 101. Furthermore, the coding unit 1071performs turbo coding, based on information that is used in thescheduling of the PUSCH.

The modulation unit 1073 performs the modulation on coded bits that areinput from the coding unit 1071, in compliance with the modulationscheme notified with the downlink control information, such as BPSK,QPSK, 16 QAM, or 64 QAM, or the modulation scheme that is prescribed inadvance on every channel.

The uplink reference signal generation unit 1079 generates a sequencethat is acquired according to a rule (formula) prescribed in advance,based on a physical cell identity (PCI) (also referred to as a Cell ID)for identifying the base station apparatus 3, a bandwidth over which theuplink reference signal is arranged, a cyclic shift that is notifiedwith the uplink grant, a parameter value for generation of a DMRSsequence, and the like.

In accordance with the control signal that is input from the controlunit 103, the multiplexing unit 1075 rearranges modulation symbols ofthe PUSCH in parallel and then performs Discrete Fourier Transform (DFT)on the rearranged modulation symbols. Furthermore, the multiplexing unit1075 multiplexes PUCCH and PUSCH signals and the generated uplinkreference signal for every transmit antenna port. To sum up, themultiplexing unit 1075 arranges the PUCCH and PUSCH signals and thegenerated uplink reference signal in the resource element for everytransmit antenna port.

The radio transmitting unit 1077 performs Inverse Fast Fourier Transform(IFFT) on the multiplexed signal, performs the modulation in compliancewith an SC-FDMA scheme, generates an SC-FDMA symbol, appends a CP to thegenerated SC-FDMA symbol, generates a digital signal in a baseband,converts the digital signal in the baseband into an analog signal,generates an in-phase component and an orthogonal component in anintermediate frequency from the analog signal, removes frequencycomponents unnecessary for an intermediate frequency band, converts(performs upconversion (up convert) on) the signal in the intermediatefrequency into a high-frequency signal, removes unnecessary frequencycomponents, and performs power amplification, and outputs a final resultto the transmit and receive antenna 111 for transmission.

The transmission power processing unit 109 performs processingassociated with the transmission power. The transmission powerprocessing unit 109 executes the transmission power control based on asetting and the like that are input from the higher-layer processingunit 101. Furthermore, the transmission power processing unit 109calculates a value of the power headroom based on the setting and thelike that are input from the higher-layer processing unit 101.

FIG. 8 is a schematic block diagram illustrating a configuration of thebase station apparatus 3 according to the present embodiment. Asillustrated in FIG. 8, the base station apparatus 3 is configured toinclude a higher-layer processing unit 301, a control unit 303, areceiving unit 305, a transmitting unit 307, and a transmit and receiveantenna 309. Furthermore, the higher-layer processing unit 301 isconfigured to include a radio resource control unit 3011, a subframesetting unit 3013, a scheduling unit 3015, and a transmission powercontrol unit 3017. Furthermore, the receiving unit 305 is configured toinclude a decoding unit 3051, a demodulation unit 3053, a demultiplexingunit 3055, and a radio receiving unit 3057. Furthermore, thetransmitting unit 307 is configured to include a coding unit 3071, amodulation unit 3073, a multiplexing unit 3075, a radio transmittingunit 3077, and a downlink reference signal generation unit 3079.

Furthermore, the higher-layer processing unit 301 performs processing ofthe Medium Access Control (MAC) layer, the Packet Data ConvergenceProtocol (PDCP) layer, the Radio Link Control (RLC) layer, and the RadioResource Control (RRC) layer. Furthermore, the higher-layer processingunit 301 generates a control signal for performing control of thereceiving unit 305, and the transmitting unit 307, and outputs thecontrol information to the control unit 303.

The radio resource control unit 3011 that the higher-layer processingunit 301 includes generates, or acquires from a higher-level node, thedownlink data (transport block) that is arranged in the downlink PDSCH,system information, the RRC message, the MAC CE, and the like, andoutputs a result of the generation or of the acquirement to thetransmitting unit 307. Furthermore, the radio resource control unit 3011manages management of various pieces of setting information on each ofthe terminal apparatus 1.

The subframe setting unit 3013 performs management of a firstconfiguration, a second configuration, and a third configuration on eachof the terminal apparatus 1. The subframe setting unit 3013 performssetting of the first configuration, the second configuration, and thethird configuration on each of the terminal apparatus 1.

Furthermore, the subframe setting unit 3013 generates first informationindicating the first configuration, second information indicating thesecond configuration, and third information indicating the thirdconfiguration. The subframe setting unit 3013 outputs the firstinformation, the second information, and the third information to theterminal apparatus 1 through the transmitting unit 307.

The base station apparatus 3 may determine the first configuration, thesecond configuration, and/or the third configuration for the terminalapparatus 1. Furthermore, the first configuration, the secondconfiguration, and/or third configuration for the terminal apparatus 1may be given to the base station apparatus 3 by the higher-level node.

For example, the subframe setting unit 3013 may determine the firstconfiguration, the second configuration, and/or the third configuration,based on an amount of uplink traffic and an amount of downlink traffic.

The subframe setting unit 3013 performs management of at least twosubframe sets. The subframe setting unit 3013 may perform setting of atleast two subframe sets on each of the terminal apparatus 1. Thesubframe setting unit 3013 may perform the setting of at least twosubframe sets on each of the cells. The subframe setting unit 3013 mayperform the setting of at least two subframe sets for each CSI process.

The subframe setting unit 3013 transmits information indicating at leasttwo subframe sets to the terminal apparatus 1 through the transmittingunit 307.

The scheduling unit 3015 that the higher-layer processing unit 301includes determines a frequency and a subframe in which the physicalchannel (the PDSCH and the PUSCH) is allocated, the coding rate and themodulation scheme of the physical channel (the PDSCH and the PUSCH), thetransmission power, and the like. The scheduling unit 3015 generates thecontrol information (for example, the DCI format) in order to performcontrol of the receiving unit 305 and the transmitting unit 307 based ona result of the scheduling, and outputs the generated information to thecontrol unit 303.

The scheduling unit 3015 generates the information that is used in thescheduling of the physical channel (the PDSCH and the PUSCH), based onthe result of the scheduling. The scheduling unit 3015 may determine thetiming at which the transmitting processing and receiving processing areperformed, based on the first configuration, the second configuration,and/or the third configuration.

The transmission power control unit 3017 that the higher-layerprocessing unit 301 includes controls processing associated with thetransmission power, which is executed by the terminal apparatus 1. Thetransmission power control unit 3017 transmits information that is usedin order for the terminal apparatus 1 to execute the transmission powercontrol, to the terminal apparatus 1 through the transmitting unit 307.The transmission power control unit 3017 transmits information that isused in order for the terminal apparatus 1 to report the power headroom,to the terminal apparatus 1 through the transmitting unit 307.

The control unit 303 generates the control signal for performing controlof the receiving unit 305 and the transmitting unit 307, based on thecontrol information from the higher-layer processing unit 301. Thecontrol unit 303 outputs the generated control signal to the receivingunit 305 and the transmitting unit 307, and performs control of thereceiving unit 305 and the transmitting unit 307.

In accordance with the control signal that is input from the controlunit 303, the receiving unit 305 demultiplexes, demodulates, and decodesa received signal that is received from the terminal apparatus 1 throughthe transmit and receive antenna 309, and outputs the resultinginformation to the higher-layer processing unit 301. The radio receivingunit 3057 converts an uplink signal received through the transmit andreceive antenna 309 into a baseband signal by performing the downconversion, removes unnecessary frequency components, controls anamplification level in such a manner as to suitably maintain a signallevel, performs the orthogonal demodulation based on an in-phasecomponent and an orthogonal component of the received signal, andconverts the resulting orthogonally-demodulated analog signal into adigital signal.

The radio receiving unit 3057 removes a portion corresponding to theguide interval (GI) from the digital signal that results from theconversion. The radio receiving unit 3057 performs the Fast FourierTransform (FFT) on the signal from which the guide interval is removed,and outputs the resulting signal to the demultiplexing unit 3055 thatextracts the signal in the frequency domain.

The demultiplexing unit 1055 demultiplexes the signal that is input fromthe radio receiving unit 3057 into the PUCCH, the PUSCH, and the signalsuch as the uplink reference signal. Moreover, the demultiplexing isperformed based on radio resource allocation information that isdetermined in advance in the radio resource control unit 3011 by thebase station apparatus 3, and that is included in the uplink grantnotified to each terminal apparatus 1.

Furthermore, the demultiplexing unit 3055 performs correction of thechannels of the PUCCH and the PUSCH. Furthermore, the demultiplexingunit 3055 demultiplexes the uplink reference signal.

A demodulation unit 3053 performs Inverse Discrete Fourier Transform(IDFT) on the PUSCH, acquires the modulation symbol, and performs thedemodulation of the received signal with respect to each of themodulation symbols of the PUCCH and the PUSCH, using the modulationscheme prescribed in advance, such as the Binary Phase Shift Keying(BPSK), QPSK, 16 QAM, or 64 QAM, or the modulation scheme that the basestation apparatus 3 itself notifies, in advance with the uplink grant,to each of the user terminal 1.

The decoding unit 3051 performs the decoding on the demodulated codedbits of the PUCCH and the PUSCH at the coding rate in compliance with acoding scheme prescribed in advance, which is prescribed in advance, oris notified in advance with the uplink grant to the terminal apparatus 1by the base station apparatus 3 itself, and outputs to the higher-layerprocessing unit 101 the uplink data and the uplink control informationthat are decoded. In a case where the PUSCH is retransmitted, thedecoding unit 3051 performs the decoding using the coded bits that areinput from the higher-layer processing unit 301 and that are retained ina HARQ buffer and the demodulated coded bits.

The channel measurement unit 309 measures an estimated value for thechannel or channel quality, and the like, based on the uplink referencesignal that is input from the demultiplexing unit 3055, and outputs aresult of the measurement to the demultiplexing unit 3055 and thehigher-layer processing unit 301.

The transmitting unit 307 generates the downlink reference signal inaccordance with the control signal that is input from the control unit303, codes and modulates the HARQ indicator, the downlink controlinformation, and the downlink data that are input from the higher-layerprocessing unit 301, multiplexes the PHICH, the PDCCH, the EPDCCH, thePDSCH, and the downlink reference signal, and transmits a result of themultiplexing to the terminal apparatus 1 through the transmit andreceive antenna 309.

The coding unit 3071 performs the coding on the HARQ indicator, thedownlink control information, and the downlink data that are input fromthe higher-layer processing unit 301. When performing the coding, thecoding unit 3071 uses the coding scheme that is prescribed in advance,such as block coding, convolutional coding, or turbo coding, or thecoding scheme that is determined by the radio resource control unit3011. The modulation unit 3073 performs the modulation on the coded bitsthat are input from the coding unit 3071. When performing themodulation, the modulation unit 3073 uses the modulation scheme that isin advance prescribed, such as BPSK, QPSK, 16 QAM, or 64 QAM, or themodulation scheme that is determined by the radio resource control unit3011.

The downlink reference signal generation unit 3079 generates as thedownlink reference signal a sequence that is already known to theterminal apparatus 1, which is acquired according to a rule that isprescribed in advance based on the physical cell identity (PCI) foridentifying the base station apparatus 3, and the like. The multiplexingunit 3075 multiplexes the modulated modulation symbol of each channeland the generated downlink reference signal. To sum up, the multiplexingunit 3075 arranges the modulated modulation symbol of each channel andthe generated downlink reference signal in the resource elements.

The radio transmitting unit 3077 performs Inverse Fast Fourier Transform(IFFT) on the multiplexed modulation symbol and the like, performs themodulation in compliance with an OFDM scheme, appends the guide intervalto the OFDM-modulated OFDM symbol, generates a digital signal in thebaseband, converts the digital signal in the baseband into an analogsignal, generates an in-phase component and an orthogonal component inthe intermediate frequency from the analog signal, removes unnecessaryfrequency components using a low pass filter, performs up conversion toa carrier frequency, amplifies power, and transmit a final result to thetransmit and receive antenna 309.

The first configuration, the second configuration, and the thirdconfiguration will be described in detail.

The first configuration is also referred to as an uplink referenceuplink-downlink configuration. Furthermore, the first configuration isalso referred to a serving cell uplink-downlink configuration.Furthermore, the first configuration is also referred to as an uplinkreference configuration. Furthermore, the first configuration may bereferred to as a first parameter.

Furthermore, the second configuration is also referred to as a downlinkreference uplink-downlink configuration. Furthermore, the secondconfiguration is also referred to as a downlink reference configuration.Furthermore, the second configuration may be referred to as a secondparameter.

Furthermore, the third configuration is also referred to as atransmission direction uplink-downlink configuration. Furthermore, thethird configuration may be referred to as a third parameter.

For example, the first configuration, the second configuration, and thethird configuration may be defined based on an uplink-downlinkconfiguration. Here, the uplink-downlink configuration is aconfiguration associated with a subframe pattern within the radio frame.That is, the uplink-downlink configuration indicates which subframewithin the radio frame is a downlink subframe, an uplink subframe, or aspecial subframe.

That is, the first configuration, the second configuration, and thethird configuration may be defined by patterns of the downlink subframe,the uplink subframe, and the special subframe within the radio frame.

Here, patterns of the downlink subframe, the uplink subframe, and thespecial subframe indicate which one of the subframes #0 to #9 is adownlink subframe, an uplink subframe, and a special subframe.Preferably, D, U, and S (which indicate the downlink subframe, theuplink subframe, and the special subframe, respectively) should becollectively expressed as an arbitrary combination of D, U, and S, whichis 10 in length. Furthermore, more preferably, the leading subframe(that is, a subframe #0) should be D, and the second subframe (that is,a subframe #1) should be S.

FIG. 9 is a table illustrating an example of the uplink-downlinkconfiguration, according to the present embodiment. In FIG. 9, Dindicates a downlink subframe. Furthermore, U indicates an uplinksubframe. Furthermore, S indicates a special subframe.

Here, when the uplink-downlink configuration i is set as the firstconfiguration, the first configuration i is said to be set. Furthermore,when the uplink-downlink configuration i is set as the secondconfiguration, the second configuration i is said to be set.Furthermore, when the uplink-downlink configuration i is set as thethird configuration, the third configuration i is said to be set.

The base station apparatus 3 sets the first configuration, the secondconfiguration, and the third configuration. Furthermore, the basestation apparatus 3 may transmit the first information indicating thefirst configuration to the terminal apparatus 1. Furthermore, the basestation apparatus 3 may transmit the second information indicating thesecond configuration to the terminal apparatus 1. Furthermore, the basestation apparatus 3 may transmit the third information indicating thethird configuration to the terminal apparatus 1.

For example, the base station apparatus 3 may transmit the firstinformation in a state where the first information is included in atleast one among the master information block, the system informationblock type-1 message, the system information message, the RRC message,the MAC CE, and the control information (for example, the DCI format) inthe physical layer.

Furthermore, the base station apparatus 3 may transmit the secondinformation in a state where the second information is included in atleast one among the master information block, the system informationblock type-1 message, the system information message, the RRC message,the MAC CE, and the control information (for example, the DCI format) inthe physical layer.

Furthermore, the base station apparatus 3 may transmit the thirdinformation in a state where the third information is included in atleast one among the master information block, the system informationblock type-1 message, the system information message, the RRC message,the MAC CE, and the control information (for example, the DCI format) inthe physical layer.

For example, the base station apparatus 3 may transmit the firstinformation for the primary cell, the second information for the primarycell, the third information for the primary cell, the first informationfor the secondary cell, the second information for the secondary cell,the third information for the secondary cell, to the terminal apparatus1 that two cells, configured from one primary cell and one secondarycell, are set to serve.

FIG. 10 is a flowchart illustrating a method of setting the firstconfiguration and the second configuration according to the presentembodiment. The terminal apparatus 1 sets the first configuration to beapplied to a certain cell, based on the first information (S1000).Furthermore, the terminal apparatus 1 determines whether the secondinformation for the certain cell is received (S1002). Furthermore, in acase where the second information for the certain cell is received, theterminal apparatus 1 sets the second configuration to be applied to thecertain cell, based on the second information for the certain cell(S1006).

In a case where the second information for the certain cell is notreceived (else/otherwise), the terminal apparatus 1 sets the secondconfiguration to be applied to the certain cell, based on the firstinformation for the certain cell (S1004). Here, the second configurationthat is set based on the first information may be referred to as theserving cell uplink-downlink configuration.

The terminal apparatus 1 receives the second information and, based onthe second information, determines the subframe that is available forthe transmission of the uplink signal. Furthermore, the terminalapparatus 1 monitors the third information. Furthermore, in a case wherethe third information is received, the terminal apparatus 1 determinesthe subframe that is available for the transmission of the uplinksignal, based on the third information.

The first configuration will be described. The first configuration is atleast used in a certain cell, in order to specify (“specify” hereinafterincludes at least the meanings of “select”, “determine”, and “indicate”)the subframe that is, or is not, available for the uplink transmission.

The terminal apparatus 1 does not perform the transmission for theuplink in the subframe that is indicated by the first configuration asthe downlink subframe. Furthermore, the terminal apparatus 1 does notperform the transmission for the uplink in the DwPTS and the GP of thesubframe that is indicated by the first configuration as the specialsubframe.

The second configuration will be described. The second configuration isat least used in a certain cell in order to specify the subframe thatis, or not, available for the downlink transmission.

The terminal apparatus 1 does not perform the downlink transmission inthe subframe that is indicated by the second configuration as the uplinksubframe. Furthermore, the terminal apparatus 1 does not perform thedownlink transmission in the UpPTS and the GP of the subframe that isindicated by the second configuration as the special subframe.

Here, the terminal apparatus 1 that sets the second configuration basedon the first information may perform a measurement (for example, ameasurement associated with the channel state information) that uses thedownlink signal in the DwPTS of the downlink subframe or the specialsubframe that is indicated by the first configuration or the secondconfiguration.

Furthermore, the terminal apparatus 1 that sets the second configurationbased on the second information may perform the measurement that usesthe downlink signal in the DwPTS of the downlink subframe or the specialsubframe that is indicated by the first configuration.

FIG. 11 is a diagram illustrating a relationship between the subframethat is indicated by the first configuration and the subframe that isindicated by the second configuration according to the presentembodiment. In FIG. 11, D indicates the downlink subframe, U indicatesthe uplink subframe, and S indicates the special subframe.

The base station apparatus 3 may specify the second configuration amonga configuration set (configuration of a set) that is limited based onthe first configuration. That is, the second configuration may be anelement in the configuration set that is limited based on the firstconfiguration. For example, the configuration set that is limited basedon the first configuration may include the UL-DL configuration thatsatisfies conditions (a) to (c) illustrated in FIG. 11.

Here, the subframe that is indicated as the uplink subframe by the firstconfiguration and is indicated as the uplink subframe by the secondconfiguration is also referred to as a fixed uplink subframe.

Here, the subframe that is indicated as the downlink subframe by thefirst configuration and is indicated as the downlink subframe by thesecond configuration is also referred to as a fixed downlink subframe.

Furthermore, the subframe that is indicated as the special subframe bythe first configuration and is indicated as the special subframe by thesecond configuration is also referred to as a fixed special subframe.

Furthermore, the subframe that is indicated as the uplink subframe bythe first configuration and is indicated as the downlink subframe by thesecond configuration is also referred to as a first flexible subframe.The first flexible subframe is a subframe that is reserved for thetransmission for the uplink and the downlink.

Furthermore, the subframe that is indicated as the special subframe bythe first configuration and is indicated as the downlink subframe by thesecond configuration is also referred to as a second flexible subframe.The second flexible subframe is reserved for the downlink transmission.Furthermore, the second flexible subframe is a subframe that is reservedfor the downlink transmission in the DwPTS and is reserved for thetransmission for the uplink in the UpPTS.

The first flexible subframe and the second flexible subframe arehereinafter collectively referred to as a flexible subframe.

The third configuration will be described. The base station apparatus 3and the terminal apparatus 1 set the third configuration associated withtransmission direction (uplink/downlink) in the subframe. That is, thethird configuration may be used to determine the transmission directionin the subframe. For example, the terminal apparatus 1 may control thetransmission in the flexible subframe, based on the schedulinginformation (the DCI format and/or the HARQ-ACK) and the thirdconfiguration.

That is, the third information that indicates the third configurationmay be used to indicate the subframe that is available for the uplinktransmission. Furthermore, the third information may be used to indicatethe subframe that is available for the downlink transmission.Furthermore, the third information may be used to indicate the subframethat is available for the uplink transmission in the UpPTS and for thedownlink transmission in the DwPTS.

Furthermore, the third configuration may be used to specify thetransmission direction in the subframe that is indicated by the firstconfiguration as the uplink subframe and is indicated by the secondconfiguration as the downlink subframe. Furthermore, the thirdconfiguration may be used to specify the transmission direction in thesubframe that is indicated by the first configuration as the specialsubframe and is indicated by the second configuration as the downlinksubframe.

That is, the third configuration is used to specify the transmissiondirection in the subframes that are indicated by the first configurationand the second configuration as the subframes that are different intransmission direction.

Here, the base station apparatus 3 may perform the scheduling of thedownlink transmission in the subframe that is indicated by the thirdconfiguration as the downlink subframe.

Furthermore, the terminal apparatus 1 may perform the receivingprocessing of the downlink signal in the subframe that is indicated bythe third configuration as the downlink subframe. Furthermore, theterminal apparatus 1 may perform the monitoring of the PDCCH/EPDCCH inthe subframe that is indicated by the third configuration as thedownlink subframe.

Furthermore, the terminal apparatus 1 may perform receiving processingof the PDSCH in the subframe that is indicated by the thirdconfiguration as the downlink subframe, based on detection of thedownlink assignment transmitted on the PDCCH/EPDCCH.

Furthermore, in a case where the transmission of the uplink signal(PUSCH/SRS) in the subframe that is indicated by the third configurationas the downlink subframe is scheduled or set, the terminal apparatus 1does not perform the transmitting processing of the uplink signal(PUSCH/SRS) in the subframe.

Furthermore, the base station apparatus 3 may perform the scheduling ofthe uplink transmission in the subframe that is indicated by the thirdconfiguration as the uplink subframe.

Furthermore, the base station apparatus 3 may perform the scheduling ofthe downlink transmission in the subframe that is indicated by the thirdconfiguration as the uplink subframe. Here, the scheduling of thedownlink transmission by the base station apparatus 3 may be prohibitedin the subframe that is indicated by the third configuration as theuplink subframe.

The terminal apparatus 1 may perform the transmitting processing of theuplink signal in the subframe that is indicated by the thirdconfiguration as the uplink subframe. Furthermore, in a case where thetransmission of the uplink signal (PUSCH/DMRS/SRS) in the subframe thatis indicated by the third configuration as the uplink subframe isscheduled or set, the terminal apparatus 1 may perform the transmittingprocessing of the uplink signal (PUSCH/DMRS/SRS) in the subframe.

Furthermore, the terminal apparatus 1 may perform the receivingprocessing of the downlink signal in the subframe that is indicated bythe third configuration as the uplink subframe, and in which the uplinktransmission is not scheduled. Here, the receiving processing of thedownlink signal by the terminal apparatus 1 may be prohibited in thesubframe that is indicated by the third configuration as the uplinksubframe.

Furthermore, the base station apparatus 3 may perform the scheduling ofthe downlink transmission in the DwPTS of the subframe that is indicatedby the third configuration as the special subframe.

The terminal apparatus 1 may perform the receiving processing of thedownlink signal in the DwPTS of the subframe that is indicated by thethird configuration as the special subframe. Furthermore, the terminalapparatus 1 may perform the monitoring of the PDCCH/EPDCCH in the DwPTSof the subframe that is indicated by the third configuration as thespecial subframe.

Furthermore, the terminal apparatus 1 may perform the receivingprocessing of the PDSCH in the DwPTS of the subframe that is indicatedby the third configuration as the special subframe, based on thedetection of the downlink assignment that is transmitted on thePDCCH/EPDCCH.

Furthermore, in a case where the transmission of the PUSCH in thesubframe that is indicated by the third configuration as the specialsubframe is scheduled or set, the terminal apparatus 1 does not performthe transmitting processing of the PUSCH in the subframe.

Furthermore, in a case where the transmission of the SRS in the UpPTS ofthe subframe that is indicated by the third configuration as the specialsubframe is scheduled or set, the terminal apparatus 1 may perform thetransmitting processing of the SRS in the UpPTS of the subframe.

HARQ timing for the uplink will be described. For example, the firstconfiguration may be used to specify a correspondence between a subframen in which the PDCCH/EPDCCH/PHICH is allocated and a subframe n+k inwhich the PUSCH that the PDCCH/EPDCCH/PHICH corresponds to is allocated.

FIG. 12 is a diagram illustrating an example of the correspondencebetween the subframe n in which the PDCCH/EPDCCH/PHICH is allocated andthe subframe n+k in which the PUSCH that the PDCCH/EPDCCH/PHICHcorresponds to is allocated, according to the present embodiment. Whendescriptions are provided below referring to FIG. 12, the firstconfiguration is also simply referred to as the UL-DL configuration.

The terminal apparatus 1 specifies a value of k, based on a tableillustrated in FIG. 12. Here, the subframe n and the subframe n+k aresubframes that are intended for the terminal apparatus 1 (at theterminal apparatus 1 side).

In a case where, in the subframe n, the PDCCH/EPDCCH that corresponds toa cell where UL-DL configurations 1 to 6 are set to be applied, and thatinvolves the uplink grant destined for the terminal apparatus 1, isdetected, the terminal apparatus 1 performs the transmission on thePUSCH that corresponds to the uplink grant, in the subframe n+k that isspecified based on the table in FIG. 12.

Here, the transmission on the PUSCH that corresponds to the uplink grantincludes the meaning of the transmission on the PUSCH that is scheduledusing the uplink grant. Furthermore, the performing of the transmissionincludes the meaning of adjusting of the transmission on the PUSCH.

Furthermore, in a case where, in the subframe n, the PHICH thatcorresponds to the cell where the UL-DL configurations 1 to 6 are set tobe applied, and that involves the NACK destined for the terminalapparatus 1, is detected, the terminal apparatus 1 performs thetransmission on the PUSCH that corresponds to the PHICH, in the subframen+k that is specified based on the table in FIG. 13.

Here, a two-bit uplink index (UL index) is included in the uplink grantdestined for the terminal apparatus 1, which corresponds to a cell wherethe UL-DL configuration 0 is set to be applied. An uplink index (ULindex) is not included in the uplink grant destined for the terminalapparatus 1, which corresponds to a cell where the UL-DL configurations1 to 6 are set to be applied.

Furthermore, in a case where in the subframe n, a Most Significant Bit(MSB) of the uplink index that is included in the uplink grant thatcorresponds to the cell where the UL-DL configuration 0 is set to beapplied is set to 1, the terminal apparatus 1 performs the transmissionon the PUSCH that corresponds to the uplink grant, in the subframe n+kthat is specified based on the table in FIG. 12.

Furthermore, in a case where, in a first resource set where the subframen=0, or n=5, the PHICH that involves the NACK that corresponds to thecell where the UL-DL configuration 0 is set to be applied is received,the terminal apparatus 1 performs the transmission on the PUSCH thatcorresponds to the PHICH, in the subframe n+k that is specified based onthe table in FIG. 12.

Furthermore, in a case where in the subframe n, a Least Significant Bit(LSB) of the uplink index that is included in the uplink grant thatcorresponds to the cell where the UL-DL configuration 0 is set to beapplied is set to 1, the terminal apparatus 1 performs the transmissionon the PUSCH that corresponds to the uplink grant, in the subframe n+7.

Furthermore, in a case where, in a second resource set when the subframen=0, or n=5, the PHICH that involves the NACK that corresponds to thecell where the UL-DL configuration 0 is set to be applied is received,the terminal apparatus 1 performs the transmission on the PUSCH thatcorresponds to the uplink grant, in the subframe n+7.

Furthermore, when the subframe n=1, or n=6, in a case where the PHICHthat involves the NACK that corresponds to the cell where the UL-DLconfiguration 0 is set to be applied is received, the terminal apparatus1 performs the transmission on the PUSCH that corresponds to the uplinkgrant, in the subframe n+7.

Furthermore, for example, in a case where in [SFN=m, subframe 1], thePDCCH/EPDCCH/PHICH that corresponds to the cell where the UL-DLconfiguration 0 is set to be applied is detected, the terminal apparatus1 performs the transmission on the PUSCH, in a subframe [subframe SFN=m,subframe 7] that follows after 6.

Furthermore, the first configuration may be used to specify acorrespondence between the subframe n in which the PHICH is allocatedand a subframe n−k in which the PUSCH that the PHICH corresponds to isallocated.

FIG. 13 is a diagram illustrating an example of the correspondencebetween the subframe n in which the PHICH is allocated, and the subframen−k in which the PUSCH that the PHICH corresponds to is allocated,according to the present embodiment. When descriptions are providedbelow referring to FIG. 13, the first configuration is also simplyreferred to as the UL-DL configuration.

The terminal apparatus 1 specifies the value of k, based on a tableillustrated in FIG. 13. Here, the subframe n and the subframe n−k aresubframes that are intended for the terminal apparatus 1 (at theterminal apparatus 1 side).

For example, for a cell where the UL-DL configurations 1 to 6 are set tobe applied, in the subframe n, the HARQ-ACK (also possibly the HARQindicator) that is received on the PHICH that corresponds to the cell isassociated with the transmission on the PUSCH, in the subframe n−k thatis specified based on a table in FIG. 13.

Furthermore, for a cell where the UL-DL configuration 0 is set to beapplied, in the first resource set when the subframe n=0, or n=5, orwhen the subframe n=1, or n=6, the HARQ-ACK that is received on thePHICH that corresponds to the cell is associated with the transmissionon the PUSCH, in the subframe n−k that is specified based on the tablein FIG. 13.

Furthermore, for a cell where the UL-DL configuration 0 is set to beapplied, in the second resource set when the subframe n=0, or n=5, theHARQ-ACK that is received on the PHICH that corresponds to the cell isassociated with the transmission on the PUSCH, in a subframe n−6.

Furthermore, for example, for a cell where a UL-DL configuration 1 isset to be applied, in [SFN=m, subframe 1], the HARQ-ACK that is receivedthrough the PHICH is associated with the transmission on the PUSCH, in asubframe [SFN=m−1, subframe 7] of four subframes previously.

Furthermore, the first configuration may be used to specify acorrespondence between the subframe n in which the PUSCH is allocatedand a subframe n+k in which the PHICH that the PUSCH corresponds to isallocated.

FIG. 14 is a diagram illustrating an example of the correspondencebetween the subframe n in which the PUSCH is allocated, and the subframen+k in which the PHICH that the PUSCH corresponds to is allocated,according to the present embodiment. When descriptions are providedbelow referring to FIG. 14, the first configuration is also simplyreferred to as the UL-DL configuration.

The terminal apparatus 1 specifies the value of k, based on a tableillustrated in FIG. 14. Here, the subframe n and the subframe n+k aresubframes that are intended for the terminal apparatus 1 (at theterminal apparatus 1 side).

In a case where in the subframe n, the transmission on the PUSCH isscheduled, the terminal apparatus 1 determines a PHICH resource in thesubframe n+k that is specified in the table in FIG. 14.

For example, in a case where, for the cell where the UL-DL configuration0 is set to be applied, in [SFN=m, subframe n=2], the transmission onthe PUSCH is scheduled, the PHICH resource is determined in [SFN=m,subframe n=6].

The HARQ timing for the downlink will be described. For example, thesecond configuration may be used to specify a correspondence between thesubframe n in which the PDSCH is arranged and the subframe n+k in whichthe HARQ-ACK that corresponds to the PDSCH is transmitted.

FIG. 15 is a diagram illustrating an example of a correspondence betweena subframe n−k in which the PDSCH is allocated and the subframe n inwhich the HARQ-ACK that the PDSCH corresponds to is transmitted,according to the present embodiment. When descriptions are providedbelow referring to FIG. 15, the second configuration is also simplyreferred to as the UL-DL configuration.

The terminal apparatus 1 specifies the value of k, based on a tableillustrated in FIG. 15. Here, the subframe n−k and the subframe n aresubframes that are intended for the terminal apparatus 1 (at theterminal apparatus 1 side).

the terminal apparatus 1 transmits the HARQ-ACK in the subframe n in acase where the transmission on the PDSCH, that is intended for theterminal apparatus 1 and for which the HARQ-ACK should be transmitted,is detected within the subframe n−k (k is specified in a table in FIG.15) of a cell.

For example, in response to the transmission on the PDSCH that isscheduled by the DCI format with the CRC scrambled by the C-RNTI, theterminal apparatus 1 may perform the HARQ-ACK response.

For example, when the subframe n=2, the terminal apparatus 1 replies tothe PDSCH that is received in the subframe n−6 and/or n−7 from the cellwhere the UL-DL configuration 1 is set to be applied, with the HARQ-ACK.

Here, for the cell where the dynamic TDD is not set to be applied, thesecond configuration may not be defined. In this case, the base stationapparatus 3 and the terminal apparatus 1 may perform processing based onthe first configuration (serving cell UL-DL configuration) instead ofperforming the processing based on the second configuration describedabove.

Here, in a case where the adjacent cell and the serving cell aredifferent in UL-DL configuration, an interference state differs from onesubframe to another. Accordingly, according to the present embodiment,at least two (multiple) subframe sets are defined. Here, for example,the multiple subframe sets are ones associated with the transmissionpower control for the uplink. Furthermore, the multiple subframe setsare ones associated with power headroom reporting. For example, thesubframe set may be configured based on the interference state.

FIG. 16 is a diagram illustrating one configuration example of thesubframe set according to the present embodiment. In FIG. 16, Dindicates the downlink subframe, U indicates the uplink subframe, and Sindicates the special subframe. Furthermore, in FIG. 16, a indicates asubframe that belongs to a first subframe set, and b indicates asubframe that belongs to a second subframe set. Furthermore, F indicatesthe first flexible subframe.

In FIG. 16, in subframes {2, 3, 4, 7, 8, and 9} in the serving cell, theuplink transmission is performed (or there is the likelihood ofperforming the uplink transmission). Furthermore, in subframes {0, 1, 4,5, 6, and 9} in the adjacent cell, the downlink transmission isperformed, and in subframes {2, 3, 7, and 8} in the adjacent, the uplinktransmission is performed.

That is, in the serving cell, the interference state in the subframes{2, 3, 7, and 8} is different from that of the subframes {4 and 9} (orthere is the likelihood that the interference state will do so).Accordingly, as illustrated in FIG. 16, the first subframe set isconfigured from the subframes {2, 3, 7, and 8}. Furthermore, the secondsubframe set is configured from the subframes {4 and 9}.

For example, the base station apparatus 3 may transmit informationindicating the subframe set to the terminal apparatus 1 using thehigher-layer signaling. Furthermore, the terminal apparatus 1 may setthe subframe set based on the information indicating the subframe set,which is transmitted using the higher-layer signaling.

Furthermore, the subframe set may be implicitly configured based on thefirst flexible subframe. For example, the first subframe set isconfigured from the first flexible subframe, and the second subframe setis configured from the subframe that is designated as the uplinksubframe based on the first configuration.

Here, in the uplink in the radio communication system, because powerconsumption by the terminal apparatus 1 is suppressed, or interferencewith other cells is reduced, Transmission Power Control (TPC) isperformed.

For example, in a case where the transmission on the PUSCH is performedand the transmission on the PUCCH is not simultaneously performed, theterminal apparatus 1 may set a transmission power value for thetransmission on the PUSCH in a certain subframe i for a certain cell c,based on Equation (1). SetX in Equation is described below as indicatingan X-th subframe. For example, X is a natural number. P_(real,c,setX)(i)in Equation (1) is defined based on Equation (2).[Math. 1]P _(PUSCH,c)=min{P _(CMAX,c)(i),P _(real,c,setX)(i)} [dBm]  (1)[Math. 2]P _(real,c,setX)=10 log₁₀(M _(PUSCH,c)(i))+P _(C) _(_)_(PUSCH,c,setx)(j)+α_(c,setX)(j)·PL _(c)+Δ_(TF,c)(i)+f _(c,setX)(i)  (2)

Here, P_(real,c,setX)(i) is a power value that is calculated (estimated)based on a real transmission with respect to the PUSCH. Furthermore, thecalculation (estimation) of the power value based on the realtransmission for the PUSCH includes the meaning of the calculation(estimation) of the power value based on the real transmission on thePUSCH.

For example, in a case where the transmission on the PUSCH is performedand the transmission on the PUCCH is simultaneously performed, theterminal apparatus 1 may set a transmission power value for thetransmission on the PUSCH in a certain subframe i for a certain cell c,based on Equation (3).[Math. 3]P _(PUSCH,c)(i)=min{10 log₁₀(p _(CMAX,c)(i)−p _(PUCCH,c)(i)),P_(real,c,setX)(i)} [dBm]   (3)

Here, P_(PUSCH,c)(i) indicates the transmission power value with respectto the transmission on an i-th subframe. Furthermore, min{X, Y} is afunction for selecting a minimum value from X and Y. Furthermore,P_(CMAC,c) indicates a maximum transmission power value and is set bythe terminal apparatus 1.

Furthermore, p_(CMAX,c) indicates a linear value of P_(CMAX,c).Furthermore, p_(PUCCH) indicates a linear value of P_(PUCCH)(i).P_(PUCCH)(i) is described below.

Furthermore, M_(PUSCH,c) indicates the PUSCH resource (for example, thebandwidth) that is allocated by the base station apparatus 3 and isexpressed by the number of resource blocks. Furthermore, P₀ _(_)_(PUSCH,c,setX) is a parameter indicating the transmission power that isa basis for the transmission on the PUSCH. For example, P₀ _(_)_(PUSCH,c,setX) is composed of a sum of a cell-specific parameter P₀_(_) _(NOMINAL) _(_) _(PUSCH,c,setX) that is indicated by the higherlayer, and a user equipment-specific parameter P₀ _(_) _(UE) _(_)_(PUSCH,c,setX) that is indicated by the higher layer.

The base station apparatus 3 may transmit information for indicating P₀_(_) _(PUSCH,c,setX) to the terminal apparatus 1 for each subframe setusing the higher-layer signaling. That is, P₀ _(_) _(PUSCH,c,setX) ineach of the first subframe set and the second subframe set may beindependently configured for the transmission on the PUSCH. The basestation apparatus 3 may configure the cell-specific parameter P₀ _(_)_(NOMINAL) _(_) _(PUSCH,c,setX) and/or the user equipment-specificparameter P₀ _(_) _(UE) _(_) _(PUSCH,c,setX) for each subframe set.

Furthermore, the cell-specific parameter P₀ _(_) _(NOMINAL) _(_)_(PUDVH,c,setX) may be configured as a parameter that is common tomultiple subframe sets. That is, the base station apparatus 3 mayconfigure the cell-specific parameter P₀ _(_) _(NOMINAL) _(_)_(PUSCH,c,setX) as a parameter common to multiple subframes sets and mayconfigure the user equipment-specific parameter P₀ _(_) _(US) _(_)_(PUSCH,c,setX) for each subframe set. Furthermore, the userequipment-specific parameter P₀ _(_) _(UE) _(_) _(PUSCH,c,setX) may beconfigured as a parameter that is common to multiple subframe sets.

Furthermore, PL_(c) indicates a downlink pathloss estimate for a certaincell and is calculated in the terminal apparatus 1. Here, PL_(c) may becommon to multiple subframe sets.

Furthermore, α_(c,setX) indicates a coefficient by which the pathloss ismultiplied and is indicated by the higher layer. For example, the basestation apparatus 3 may transmit information for indicating α_(c,setX)to the terminal apparatus 1 for each subframe set using the higher-layersignaling. That is, α_(c,setX) may be independently configured for thetransmission on the PUSCH in each of the first subframe set and thesecond subframe set.

Here, P₀ _(_) _(PUSCH,c,setX) and α_(c,setX) are also referred to asopen loop parameters. That is, at least two subframe sets areconfigured, and the open loop parameters (p₀ _(_) _(PUSCH,c,setX) andα_(c,setX)) are configured for each of the subframe sets.

For example, only in a case where multiple subframe sets are configuredfor the terminal apparatus 1, the base station apparatus 3 may configurethe open loop parameter for each subframe set. Furthermore, only in acase where the second information is configured for the terminalapparatus 1, the base station apparatus 3 may set the open loopparameter for each subframe set.

Furthermore, Δ_(TF,c)(i) indicates an offset value due to the modulationscheme and the like. Furthermore, a PUSCH power control adjustment statefor the transmission on the PUSCH is given by f_(c,setX)(i). Here, anindication of whether accumulation in f_(c,setX)(i) is enabled ordisabled is given by the higher layer, based on a parameter(Accumulation-enabled). The parameter that is used to give theindication of whether the accumulation in f_(c,setX)(i) is enabled ordisabled is also referred to below as a fourth parameter.

The base station apparatus 3 may transmit the fourth parameter using thehigher-layer signaling. For example, in a case where the accumulation isenabled based on the fourth parameter given by the higher layer, theterminal apparatus 1 sets a value of f_(c,setX)(i) based on Equation(4).[Math. 4]f _(c,setX)(i)=f _(c,setX)(i−1)+δ_(PUSCH,c,setX)(i−K _(PUSCH)) ifaccumulation is enabled   (4)

Here, δ_(PUSCH,c,setX) is a correction value, and is referred to as aTPC command. That is, in a case where the accumulation is enabled basedon the fourth parameter given by the higher layer,δ_(PUSCH,c,setX)(i−K_(PUSCH)) indicates a value that is accumulated inf_(c,setX)(i−1). Here, δ_(PUSCH,c,setX)(i−K_(PUSCH)) is indicated basedon the value, which is received in a certain subframe (i−K_(PUSCH)) andwhich is set to be in a TPC command field for the PUSCH that is includedin the uplink grant corresponding to a certain cell.

For example, values that are set to be in the TPC command field (2-bitinformation field) for the PUSCH that is included in the uplink grantare mapped to accumulated correction values {−1, 0, 1, and 3}.Furthermore, a value of K_(PUSCH) is defined in advance by aspecification and the like, based on the UL-DL configuration (uplinkreference UL-DL configuration) and the subframe in which the uplinkgrant in which the corresponding TPC command is included is received.For example, the value of K_(PUSCH) is 4, 5, 6, or 7.

Here, the accumulation in f_(c,setX)(i) may be performed for eachsubframe set. That is, f_(c,setX)(i) is independently accumulated forthe transmission on the PUSCH in each of the first subframe set and thesecond subframe.

That is, in a case where the TPC command that corresponds to the firstsubframe set is received, the terminal apparatus 1 may perform theaccumulation in f_(c,setX(X=1))(i) in the first subframe set.Furthermore, in a case where the TPC command corresponding to the secondsubframe set is received, the terminal apparatus 1 may perform theaccumulation in f_(c,setX(X=2))(i) in the second subframe set.

That is, the terminal apparatus 1 may set the transmission power valuefor the transmission on the PUSCH in the subframe that belongs to theX-th subframe set, based on a set of parameters (P₀ _(_)_(PUSCH,c,setX), and/or α_(c,setX), and/or f_(c,setX)(i)).

Here, for example, in a case where multiple subframe sets areconfigured, and the parameter value for the second subframe set isconfigured (in a case where information indicating the parameter valuefor the second subframe set is received), the terminal apparatus 1 mayset the transmission power value for the transmission on the PUSCH inthe subframe that belongs to the second subframe set, based on the valuethat is configured.

Furthermore, in a case where multiple subframe sets are configured, theparameter value for the first subframe set is configured, and theparameter value for the second subframe set is not configured (in a casewhere the information indicating the parameter value for the secondsubframe set is not received), the terminal apparatus 1 may set thetransmission power value for the transmission on the PUSCH in thesubframe that belongs to the second subframe set, based on the value forthe first frame set.

That is, in this case, the parameter value for the first subframe set isconfigured to the parameter for the second subframe set. Here, a defaultvalue of a parameter for the first subframe set is defined in advance bythe specification or the like.

Furthermore, in a case where the accumulation based on the fourthparameter given by a higher layer is disabled (that is, in case wherethe accumulation is not enabled), the terminal apparatus 1 sets a valueof f_(c,setX)(i), based on Equation (5).[Math. 5]f _(c,setX)(i)=δ_(PUSCH,c,setX)(i−K _(PUSCH)) if accumulation is notenabled  (5)

That is, in the case where the accumulation based on the fourthparameter given by the higher layer is disabled,δ_(PUSCH,c,setX)(i−K_(PUSCH)) indicates an absolute value for f_(c)(i).In this case, δ_(PUSCH,c,setX)(i−K_(PUSCH)) may be set regardless of thesubframe set. That is, δ_(PUSCH,c,setX)(i−K_(PUSCH)) may be enabled forthe subframe i.

For example, values that are set to be in the TPC command field (2-bitinformation field) for the PUSCH that is included in the uplink grant(the DCI format 0 or the DCI format 4) are mapped to absolute values{−4, −1, 1, and 4}.

Furthermore, the base station apparatus 3 may configure the indicationof whether the accumulation in f_(c,setX)(i) for each of the subframesets is enabled or disenabled, for the terminal apparatus 1, using thefourth parameter. That is, based on the fourth parameter, the terminalapparatus 1 may determine whether the value of f_(c,setX)(i) for each ofthe fourth parameters is an accumulated value or is set to an absolutevalue.

For example, in a case where multiple subframe sets are configured, andthe accumulation is enabled based on the fourth parameter, the terminalapparatus 1 may accumulate the value of f_(c,setX)(i) for each of thesubframe sets. For example, in a case where the second configuration isset, and the accumulation is enabled based on the fourth parameter, theterminal apparatus 1 may accumulate the value of f_(c,setX)(i) for eachof the subframe sets.

Furthermore, in a case where multiple subframe sets are not configured,and the accumulation is enabled based on the fourth parameter, theterminal apparatus 1 may accumulate the value of f_(c,setX)(i)regardless of the subframe set. Furthermore, in a case where the secondconfiguration is not set (that is, only the first configuration is set),and the accumulation is enabled based on the fourth parameter, theterminal apparatus 1 may accumulate the value of f_(c,setX)(i)regardless of the subframe set.

Furthermore, in a case where multiple subframe sets are configured, andthe accumulation is disabled based on the fourth parameter, the terminalapparatus 1 may set the value of f_(c,setX)(i) to an absolute value.Furthermore, in a case where the second configuration is not set and theaccumulation is disabled based on the fourth parameter, the terminalapparatus 1 may set the value of f_(c,setX)(i) to an absolute value.

Furthermore, in a case where multiple subframe sets are not configured,and the accumulation is disabled based on the fourth parameter, theterminal apparatus 1 may set the value of f_(c,setX)(i) to an absolutevalue. Furthermore, in a case where the second configuration is not setand the accumulation is disabled based on the fourth parameter, theterminal apparatus 1 may set the value of f_(c,setX)(i) to an absolutevalue.

That is, regardless of whether or not multiple subframe sets areconfigured, and/or whether the second configuration is set, in a casewhere the accumulation is disabled based on the fourth parameter, theterminal apparatus 1 may set the value of f_(c,setX)(i) to an absolutevalue.

Furthermore, in a case of performing the transmission on the PUCCH, theterminal apparatus 1 sets the transmission power value for thetransmission on the PUCCH in a certain subframe i for a certain cell c,based on Equation (6). P_(real) _(_) _(PUCCH,c(i)) in Equation (6) isdefined based on Equation (7).[Math. 6]P _(PUCCH,c)(i)=min{P _(CMAX,c) ,P _(real) _(_) _(PUCCH,c)(i)}[dBm]  (6)[Math. 7]P _(real) _(_) _(PUCCh,c)(i)=P _(O) _(_) _(PUCCH,c) PL _(c) +h(n _(CQI),n _(HARQ))+Δ_(F) _(_) _(PUCCH)(F)+g(i)   (7)

Here, P_(real) _(_) _(PUCCH,c(i)) is a power value that is calculated(estimated) based on the real transmission with respect to the PUCCH.Furthermore, the calculation of the power value based on the realtransmission for the PUCCH includes the meaning of the calculation(estimation) of the power value based on the real transmission on thePUCCH.

Furthermore, P_(PUCCH,c)(i) indicates the transmission power value forthe communication on the PUCCH in the i-th subframe. That is,P_(PUCCH,c)(i) may be set regardless of the subframe set. Furthermore,P₀ _(_) _(PUCCH,c) is a parameter indicating the transmission power thatis a basis for the transmission on the PUCCH, and is indicated by thehigher layer.

Furthermore, h(n_(CQI),n_(HARQ)) is a value that is calculated based onthe number of bits that are transmitted on the PUCCH, and on a PUCCHformat. Here, n_(CQI) indicates channel state information that istransmitted on the PUCCH, and n_(HARQ) indicates HARQ information (forexample, the ACK/NACK) that is transmitted on the PUCCH.

Furthermore, Δ_(F) _(_) _(PUCCH)(F) is an offset value that is indicatedfor each PUCCH format by the higher layer. For example, Δ_(F) _(_)_(PUCCH)(F) is always set to 0 for a PUCCH format 1a. Furthermore, theterminal apparatus 1 may set a value of g(i), based on Equation (8).[Math. 8]g(i)=g(i−1)+δ_(PUCCH)(i−K _(PUCCH))  (8)

Here, δ_(PUCCH) is a correction value and is referred to as a TPCcommand. That is, δ_(PUCCH)(i−K_(PUCCH)) indicates a value that isaccumulated in g(i−1). Here, δ_(PUSCH)(i−K_(PUCCH)) is indicated basedon the value, which is received in a certain subframe (i−K_(PUCCH)) andwhich is set to be in the TPC command field for the PUCCH that isincluded in the downlink assignment corresponding to a certain cell.

For example, values that are set to be in the TPC command field (2-bitinformation field) for the PUCCH that is included in the downlinkassignment are mapped to the accumulated correction values {−1, 0, 1,and 3}. Furthermore, a value of K_(PUCCH) is defined in advance by thespecification and the like, based on the UL-DL configuration (downlinkreference UL-DL configuration) and the subframe in which the downlinkassignment in which the corresponding TPC command is included isreceived.

Here, the communication on the PUCCH may be performed only in theprimary cell. Furthermore, the transmission on the PUCCH may beperformed only in the fixed uplink subframe. Furthermore, thetransmission on the PUCCH may be performed only in a subframe thatbelongs to a first subframe set or a subframe that belongs to a secondsubframe subset.

The Power Headroom Reporting (PHR) will be described in detail.

The terminal apparatus 1 transmits the power headroom (power reservevalue) indicating a difference between a maximum transmission power anda certain power estimated for the uplink transmission to the basestation apparatus 3. That is, the power headroom reporting is used toprovide the base station apparatus 3 with a difference between themaximum transmission power (also referred to as a nominal maximumtransmission power) and the estimated power for the transmission on theUL-SCH (also possibly the PUSCH) per activated cell.

That is, the power headroom reporting is used to provide the basestation apparatus 3 how much power reserve the terminal apparatus 1 willhave with respect to the maximum transmission power after performing thetransmission on the PUSCH. Here, the power headroom reporting may beused to provide the base station apparatus 3 with a difference betweenthe maximum transmission power and the estimated power for thetransmission on the UL-SCH (also possibly the PUSCH) and the PUCCH.Furthermore, the power headroom reporting may be used to provide thebase station apparatus 3 with a maximum transmission power value.Furthermore, the power headroom is provided from the physical layer tothe higher layer and is reported to the base station apparatus 3.

For example, the base station apparatus 3 determines allocation of aresource (for example, the bandwidth) or a modulation scheme and thelike for the PUSCH, based on a power headroom value.

Here, two types (a type 1 and a type 2) of the power headroom reportsare defined. A certain power headroom is valid for a certain subframe ifor a certain cell c. Furthermore, the type-1 power headroom includestype-1-1, type-1-2, and type-1-3 power headrooms. Furthermore, thetype-2 power headroom includes type-2-1, type-2-2, type 2-3 and type-2-4power headrooms. The type-1 power headroom and the type-2 power headroomare simply also referred to below as power headrooms.

The type-1-1 power headroom is defined for a case where, in a certainsubframe i for a certain cell c, the terminal apparatus 1 performs thetransmission on the PUSCH and does not simultaneously perform thetransmission on the PUCCH. Here, the base station apparatus 3 mayconfigure the simultaneous transmission on the PUCCH and the PUSCH in acertain subframe i using a parameter (a simultaneousPUCCH-PUSCH). Thebase station apparatus 3 may transmit the parameter(simultaneousPUCCH-PUSCH) to the terminal apparatus 1 in a state wherethe parameter is included in the higher-layer signaling.

For example, in a case where, in a certain subframe i for a certain cellc, the transmission on the PUSCH is performed and the transmission onthe PUCCH is not simultaneously performed, the terminal apparatus 1calculates the type-1-1 power headroom for the transmission on the PUSCHin the certain subframe i, based on Equation (9).[Math. 9]PH _(type i,c)(i)=P _(CMAX,c)(i)−P _(real,c,setX)(i) [dB]  (9)

That is, the type-1-1 power headroom is calculated based on the realtransmission for the PUSCH. Here, the calculation of the power headroombased on the real transmission for the PUSCH includes the meaning of thecalculation of the power headroom based on the real transmission on thePUSCH.

Furthermore, the type-1-2 power headroom reporting is defined for a casewhere, in a certain subframe i for a certain cell c, the terminalapparatus 1 performs the transmission on the PUSCH and simultaneouslyperform the transmission on the PUCCH.

For example, in a case where, in a certain subframe i for a certain cellc, the transmission on the PUSCH is performed and the transmission onthe PUCCH is simultaneously performed, the terminal apparatus 1calculates the type-1-2 power headroom for the transmission on the PUSCHin the certain subframe i, based on Equation (10).[Math. 10]PH _(type i,c)(i)=P _(CMAX) _(_) _(A,c)(i)−P _(real,c,setX)(i)[dB]  (10)

That is, the type-1-2 power headroom is calculated based on the realtransmission for the PUSCH. Here, P_(CMAC) _(_) _(A) is a maximumtransmission power value that is calculated under the assumption thatthe transmission on only the PUSCH is performed in a certain subframe i.In this case, the physical layer supplies P_(CMAX) _(_) _(A) to a higherlayer instead of P_(CMAX).

Furthermore, the type-1-3 power headroom reporting is defined for a casewhere, in a certain subframe i for a certain cell c, the terminalapparatus 1 does not perform the transmission on the PUSCH.

For example, in a case where, in a certain subframe i for a certain cellc, the transmission on the PUSCH is not performed, the terminalapparatus 1 calculates the type-1-3 power headroom for the transmissionon the PUSCH in the certain subframe based on Equation (11). Here,P_(reference,c,setX)(i) in Equation (11) is defined based on Equation(12).[Math. 11]PH _(type i,c)(i)=P _(CMAX) _(_) _(B,c)(i)−P _(reference,c,setX)(i)[dB]  (11)[Math. 12]P _(reference,c,setX)(i)=P _(O) _(_) _(PUSCH,c,setX)(1)α_(c,setX)(1)·PL_(c) +f _(c,setX)(i)  (12)

Here, P_(CMAX) _(_) _(B) is calculated under the assumption that MaximumPower Reduction (MPR)=0 dB, Additional Maximum Power Reduction (AMPR)=0dB, Power management Maximum Power Reduction (P-MPR)=0 dB, and ΔT_(c)=0dB. Here, values of MPR, A-MPR, P-MPR, and ΔT_(c) are parameters thatare used to set a value of P_(CMAX,c).

That is, the type-1-3 power headroom is calculated based on a referenceformat for the PUSCH. Here, the calculation of the power headroom basedon the reference format for the PUSCH includes the meaning of thecalculation of the power headroom based on the transmission on thePUSCH, in which the reference format is used.

Furthermore, P_(reference,c,setX)(i) is a power value that is calculated(estimated) based on the reference format for the PUSCH. Here, thecalculation (estimation) of the power value based on the referenceformat for the PUSCH includes the meaning of the calculation(estimation) under the assumption that the reference format is used inthe transmission on the PUSCH.

That is, it is assumed that as the reference format for the PUSCH,M_(PUSCH,c)=1 is used in the transmission on the PUSCH in a certainsubframe i. Furthermore, P₀ _(_) _(PUSCH,c,setX)(1) is assumed as thereference format for the PUSCH. Furthermore, α_(c,setX)(1) is assumed asthe reference format of the PUSCH. Furthermore, Δ_(TF,c)(i)=0 is assumedas the reference format for the PUSCH.

Here, the type-2-1 power headroom reporting is defined for a case where,in a certain subframe i for a certain cell c, the terminal apparatus 1performs the transmission on the PUSCH and simultaneously performs thetransmission on the PUCCH.

For example, in a case where, in a certain subframe i for a certain cellc, the transmission on the PUSCH is performed and the transmission onthe PUCCH is simultaneously performed, the terminal apparatus 1calculates the type-2-1 power headroom for the transmission on the PUSCHin the certain subframe i, based on Equation (13).[Math. 13]

$\begin{matrix}{{{PH}_{{{type}\; 2},c}(i)} = {{P_{{CMAX},c}(i)} - {10\;{{\log_{10}\left( {10^{{P_{{real},c,{setX}}{(i)}}/10} + 10^{{P_{{real\_ PUCCH},c,{setX}}{(i)}}/10}} \right\}}\lbrack{dB}\rbrack}}}} & (13)\end{matrix}$

That is, the type-2-1 power headroom is calculated based on the realtransmission for the PUSCH, and the real transmission for the PUCCH.

Furthermore, the type-2-2 power headroom reporting is defined for a casewhere, in a certain subframe i for a certain cell c, the terminalapparatus 1 performs the transmission on the PUSCH and does notsimultaneously perform the transmission on the PUCCH.

For example, in a case where, in a certain subframe i for a certain cellc, the transmission on the PUSCH is performed and the transmission onthe PUCCH is not simultaneously performed, the terminal apparatus 1calculates the type-2-2 power headroom for the transmission on the PUSCHin the certain subframe i, based on Equation (14). Here, P_(reference)_(_) _(PUCCH,c)(i) in Equation (14) is defined based on Equation (15).[Math. 14]

$\begin{matrix}{{{PH}_{{{type}\; 2},c}(i)} = {{P_{{CMAX},c}(i)} - {10\;{{\log_{10}\left( {10^{{P_{{real},c,{setX}}{(i)}}/10} + 10^{{P_{{reference\_ PUCCH},c}{(i)}}/10}} \right\}}\lbrack{dB}\rbrack}}}} & (14)\end{matrix}$[Math. 15]P _(reference) _(_) _(PUCCH,c)(i)=P _(O) _(_) _(PUCCH,c) +PL _(c)+g(i)  (15)

That is, the type-2-2 power headroom is calculated based on the realtransmission for the PUSCH, and the reference format for the PUCCH.Here, the calculation of the power headroom based on the referenceformat for the PUCCH includes the meaning of the calculation of thepower headroom under the assumption that the reference format is used inthe transmission on the PUCCH.

Furthermore, P_(reference) _(_) _(PUCCH,c)(i) is a power value that iscalculated (estimated) based on the reference format of the PUCCH. Here,the calculation (estimation) of the power value based on the referenceformat for the PUCCH includes the meaning of the calculation(estimation) under the assumption that the reference format is used inthe transmission on the PUCCH.

That is, h(n_(CQI),n_(HARQ))=0 is assumed as the reference format forthe PUCCH. Furthermore, Δ_(F) _(_) _(PUCCH)(F)=0 is assumed as thereference format for the PUCCH. Furthermore, the PUCCH format 1a isassumed as the reference format for the PUCCH.

Furthermore, the type-2-3 power headroom reporting is defined for a casewhere, in a certain subframe i for a certain cell c, the terminalapparatus 1 performs the transmission on the PUCCH and does notsimultaneously perform the transmission on the PUSCH.

For example, in a case where, in a certain subframe i for a certain cellc, the transmission on the PUCCH is performed and the transmission onthe PUSCH is not simultaneously performed, the terminal apparatus 1calculates the type-2-3 power headroom for the transmission on the PUSCHin the certain subframe i, based on Equation (16).[Math. 16]

$\begin{matrix}{{{PH}_{{{type}\; 2},c}(i)} = {{P_{{CMAX},c}(i)} - {10\;{{\log_{10}\left( {10^{{P_{{reference},c,{setX}}{(i)}}/10} + 10^{{P_{{real\_ PUCCH},c}{(i)}}/10}} \right\}}\lbrack{dB}\rbrack}}}} & (16)\end{matrix}$

That is, the type-2-3 power headroom is calculated based on thereference format for the PUSCH and on the real transmission for thePUCCH.

Furthermore, the type-2-4 power headroom reporting is defined for a casewhere, in a certain subframe i for a certain cell c, the terminalapparatus 1 performs neither the transmission on the PUCCH nor thetransmission on the PUSCH.

For example, in a case where, in a certain subframe i for a certain cellc, neither the transmission on the PUCCH nor communication on the PUSCHis performed, the terminal apparatus 1 calculates the type-2-4 powerheadroom for the transmission on the PUSCH in the certain subframe i,based on Equation (17).[Math. 17]

$\begin{matrix}{{{PH}_{{{type}\; 2},c}(i)} = {{P_{{CMAX\_ B},c}(i)} - {10\;{{\log_{10}\left( {10^{{P_{{reference},c,{setX}}{(i)}}/10} + 10^{{P_{{reference\_ PUCCH},c}{(i)}}/10}} \right\}}\lbrack{dB}\rbrack}}}} & (17)\end{matrix}$

That is, the type-2-4 power headroom is calculated based on thereference format for the PUSCH and on the reference format for thePUCCH.

FIG. 17 is a diagram illustrating an example of a MAC CE structure thatis used in the power headroom reporting. In FIG. 17(a), a Power HeadroomMAC control element (Power Headroom MAC CE) is illustrated. Furthermore,in FIG. 17(b), an Extended Power Headroom MAC control element (ExtendedPower Headroom MAC CE) is illustrated.

The Power Headroom MAC control element that is illustrated in FIG. 17(a)is also referred to below as a first structure (first MAC CE).Furthermore, the Power Headroom MAC control element that is illustratedin FIG. 17(b) is also referred to as a second structure (second MAC CE).

Here, using a parameter (extended-PHR) that is included in thehigher-layer signaling, the base station apparatus 3 may instruct theterminal apparatus 1 to report the power headroom using the secondstructure. For example, in a case where two or more cells are configuredfor the uplink, the base station apparatus 3 may instruct the terminalapparatus 1 to report the power headroom, always using the secondstructure.

Furthermore, in a case where multiple subframe sets are configured, thebase station apparatus 3 may instruct the terminal apparatus 1 to reportthe power headroom, always using the second structure. Furthermore, in acase where the second configuration is configured, the base stationapparatus 3 may instruct the terminal apparatus 1 to report the powerheadroom, always using the second structure. That is, in a case whereinformation (parameter) relating to the dynamic TDD is configured forthe terminal apparatus 1, the base station apparatus 3 may instruct theterminal apparatus to report the power headroom, always using the secondstructure.

That is, in a case where multiple subframe sets are configured, the basestation apparatus 3 may always configure the parameter (extended-PHR).In a case where the information indicating the subframe set is includedin the higher-layer signaling, the base station apparatus may alwaystransmit the parameter (extended-PHR) in a state where the parameter(extended-PHR) is included in the higher-layer signaling. That is, theinformation indicating the subframe set and the parameter (extended-PHR)may be transmitted using a single PDSCH.

That is, based on the parameter (extended-PHR), the terminal apparatus 1may report the power headroom using the second structure. Furthermore,in a case where the terminal apparatus 1 is not configured to report thepower headroom using the second structure based on the parameter(extended-PHR), the terminal apparatus 1 may report the power headroomusing the first structure.

For example, in a case where a single cell is configured, and multiplesubframes are configured, and the terminal apparatus 1 is not configuredto report the power headroom using the second structure based on theparameter (extended-PHR), the terminal apparatus 1 may report one powerheadroom on any one of the subframe sets, using the first structure.

Here, the first structure that is illustrated in FIG. 17(a) isidentified by one MAC PDU subheader in which a Logical ChannelIdentifier (LCID) is included. Furthermore, the first structure may havea fixed size and may be configured from a single octet. Here, one octetis configured from 8 bits.

For example, the first structure may be defined based on the followingfields.

A field R indicates a reserved bit and, for example, is set to “0”.

A field PH is used to indicate a power headroom level. For example, thefield is 6 bits in length.

FIG. 18 illustrates a power headroom being reported and a correspondingpower headroom level. That is, FIG. 18 illustrates the power headroombeing reported and a corresponding measured value. As illustrated inFIG. 18, for example, the power headroom reporting ranges from −23 dB to+40 dB.

Furthermore, the second structure that is illustrated in FIG. 17(b) isidentified by one MAC PDU subheader in which the LCID is included. Thesecond structure has a variable size.

Here, for each of the serving cells, an octet in which a field for thetype-2 power headroom is included and an octet in which a field forassociated P_(CMAX,c) is included may be included in the secondstructure. Furthermore, for each of the subframe sets, the octet inwhich the field for the type-2 power headroom is included and the octetin which the field for associated P_(CMAX,c) is included may be includedin the second structure.

That is, for each of the subframe sets in the serving cell, the octet inwhich the field for the type-2 power headroom is included and the octetin which the field for associated P_(CMAX,c) is included may be includedin the second structure.

Furthermore, for each of the serving cells, an octet in which a fieldfor the type-1 power headroom is included and an octet in which a fieldfor associated P_(CMAX,c) is included may be included in the secondstructure. Furthermore, for each of the subframe sets, the octet inwhich the field for the type-1 power headroom is included and the octetin which the field for associated P_(CMAX,c) is included may be includedin the second structure.

That is, for each of the subframe sets in the serving cell, the octet inwhich the field for the type-1 power headroom is included and the octetin which the field for associated P_(CMAX,c) is included may be includedin the second structure.

Furthermore, FIG. 17(b) illustrates that the octet in which the fieldfor the type-2 power headroom for the primary cell (PCell) is includedand the octet in which the field for associated P_(CMA,c) is includedare included.

Furthermore, FIG. 17(b) illustrates that the octet in which the fieldfor the type-1 power headroom for the subframe set 1 for the primarycell is included and the octet in which the field for associatedP_(CMAC,c) is included are included. Furthermore, it is illustrated thatthe octet in which the field for the type-1 power headroom for thesubframe set 2 for the primary cell is included and the octet in whichthe field for associated P_(CMAC,c) is included are included. That is,it is illustrated that multiple subframe sets are set for the primarycell.

Furthermore, FIG. 17(b) illustrates that the octet in which the fieldfor the type-1 power headroom for a secondary cell 1 (SCell 1) isincluded and the octet in which the field for associated P_(CMAC,c) isincluded are included. That is, it is illustrated that multiple subframesets are not set for the secondary cell 1.

Furthermore, FIG. 17(b) illustrates that the octet in which the fieldfor the type-1 power headroom for the subframe set 1 for a secondarycell n (SCell n) is included and the octet in which the field forassociated P_(CMAC,c) is included are included. Furthermore, it isillustrated that the octet in which the field for the type-1 powerheadroom for the subframe set 2 for the secondary cell n is included andthe octet in which the field for associated P_(CMAC,c) is included areincluded. That is, it is illustrated that multiple subframe sets are setfor the secondary cell n.

For example, the second structure may be defined based on the followingfields.

A field C_(i) is used to indicate that a field for the power headroomfor the secondary cell with a serving cell index (secondary cell index)i is present. For example, in a case where the field C_(i) is set to“1”, it may be indicated that the field for the power headroom for thesecondary cell with the serving cell index i is present. For example, ina case where the field C_(i) is set to “0”, it may be indicated that thefield for the power headroom for the secondary cell with the servingcell index i is not present.

The field R indicates a reserved bit and, for example, is set to “0”.

A field V is used to indicate whether the power headroom value is basedon the real transmission or based on the reference format. Here, thereal transmission and the reference format are as described above. Forexample, for the type-1 power headroom, V=0 indicates that the realtransmission is used for the PUSCH, and V=1 indicates that the referenceformat is used for the PUSCH.

Furthermore, for the type-2 power headroom, V=0 indicates that the realtransmission is used for the PUCCH, and V=1 indicates that the referenceformat is used for the PUCCH. Moreover, for both of the type-1 powerheadroom and the type-2 power headroom, V=0 indicates that the octet inwhich the field for associated P_(CMAX,c) is included is present, andV=1 indicates that the octet in which the field for associatedP_(CMAC,c) is included is omitted.

The field PH is used to indicate a power headroom level. For example,the field is 6 bits long. As described above, the power headroom beingreported and the corresponding power headroom level are illustrated inFIG. 18.

A field P is used to indicate whether or not the terminal apparatus 1applies power back-off due to power management (P-MPR).

A field P_(CMAC,c), if this field is present, indicates P_(CMAC,c),P_(CMAC) _(_) _(A,c), or P_(CMAX) _(_) _(B,c) that is used for thecalculation of the corresponding power headroom.

As described above, the terminal apparatus 1 may calculate the powerheadroom for each of the multiple subframe sets. The power headroom thatis calculated based on the set of parameters for the first subframe setis also referred to below as the power headroom for the first subframeset. Furthermore, the power headroom that is calculated based on the setof parameters for the second subframe set is also referred to as thepower headroom for the second subframe set.

That is, the terminal apparatus 1 may calculate the power headroom forthe X-th subframe set, based on the set of parameters (P₀ _(_)_(PUSCH,c,setX), and/or α_(c,setX), and/or f_(c,setX)(i)) for the X-thsubframe set.

Furthermore, the terminal apparatus 1 may report the power headroom foreach of the multiple subframe sets, using a certain single subframe. Forexample, the terminal apparatus 1 may report the power headroom for eachof the multiple subframe sets, using the second structure. That is, theterminal apparatus 1 may transmit the power headroom for each of themultiple subframe sets through a single PUSCH, in a state where thepower headroom for each of the multiple subframe sets is included in asingle MAC CE.

That is, the terminal apparatus 1 may report the power headroom for eachof all the subframe sets for each of all activated cells with theuplink, using a certain single subframe (through a single PUSCH in thestate where the power headroom for each of all the subframe sets isincluded in a single MAC CE).

For example, the terminal apparatus 1 may calculate the power headroomfor the first subframe set and the power headroom for the secondsubframe set, and may report each of the calculated power headrooms,using the subframe that belongs to the first subframe set. Furthermore,the terminal apparatus 1 may calculate the power headroom for the firstsubframe set and the power headroom for the second subframe set, and mayreport each of the calculated power headrooms, using the subframe thatbelongs to the second subframe set.

Here, in a case where, in a certain subframe for a certain cell, thepower headroom reporting is performed using the PUSCH, the terminalapparatus 1 may calculate the power headroom for the subframe set towhich the subframe in which the power headroom reporting is performedbelongs, based on the real transmission for the PUSCH.

Furthermore, in a case where, in a certain subframe for a certain cell,the power headroom reporting is performed using the PUSCH, the terminalapparatus 1 may calculate the power headroom for a subframe setdifferent from the subframe set to which the subframe in which the powerheadroom reporting is performed belongs, based on the reference formatfor the PUSCH.

That is, in a case where the power headroom is reported on the PUSCH inthe subframe that belongs to the first subframe set for a certain cell,the terminal apparatus 1 may report the power headroom for the firstsubframe set, which is calculated based on the real transmission for thePUSCH for the certain cell, and the power headroom for the secondsubframe set, which is calculated based on the reference format for thePUSCH for the certain cell.

Furthermore, in a case where the power headroom is reported on the PUSCHin the subframe that belongs to the second subframe set for a certaincell, the terminal apparatus 1 may report the power headroom for thefirst subframe set, which is calculated based on the reference formatfor the PUSCH for the certain cell, and the power headroom for thesecond subframe set, which is calculated based on the real transmissionfor the PUSCH for the certain cell.

Furthermore, the terminal apparatus 1 may calculate the power headroomfor the subframe set to which the subframe in which the power headroomreporting is performed belongs, and may report the calculated powerheadroom in the subframe.

That is, the terminal apparatus 1 may report only the power headroom forthe first subframe set, in the subframe that belongs to the firstsubframe set. Furthermore, the terminal apparatus 1 may report only thepower headroom for the second subframe set, in the subframe that belongsto the second subframe set.

That is, the terminal apparatus 1 may calculate the power headroom forthe subframe set for each of the activated cells, to which the subframein which the power headroom reporting is performed on the PUSCH belongsin any one of the activated cells, and may report the calculated powerheadroom, in the subframe.

Here, the terminal apparatus 1 may report the power headroom for thesubframe set to which the subframe in which the power headroom reportingis performed belongs, using the first structure. Furthermore, theterminal apparatus 1 may report the power headroom for the subframe setto which the subframe in which the power headroom reporting is performedbelongs, using the second structure.

That is, the terminal apparatus 1 may switch between the power headroomreporting for the first subframe set and the power headroom reportingfor the second subframe set, based on the subframe set (that is, thefirst subframe set or the second subframe set) to which the subframe inwhich the power headroom reporting is performed belongs.

Furthermore, the terminal apparatus 1 may always report the powerheadroom for any one subframe set, regardless of the subframe set towhich the subframe in which the power headroom reporting is performedbelongs. For example, the terminal apparatus 1 may always report thepower headroom for the first subframe set. Furthermore, the terminalapparatus 1 may always report the power headroom for the second subframeset.

Furthermore, the base station apparatus 3 may transmit information thatis used to instruct the terminal apparatus 1 which subframe set thepower headroom to be reported is for, in a state where the informationis included in the higher-layer signaling.

Here, the terminal apparatus 1 may report the power headroom for any onesubframe set, using the first structure. Furthermore, the terminalapparatus 1 may report the power headroom for any one subframe set,using the second structure.

Furthermore, the terminal apparatus 1, which is instructed to alwaysreport the power headroom for a certain subframe set, may alwayscalculate the power headroom based on the reference format for thePUSCH, when reporting the power headroom in the subframe that belongs tothe subframe set different from the subframe set.

That is, in a case where the power headroom for the first subframe setis always reported, the terminal apparatus 1 may report the powerheadroom for the first subframe set, which is calculated based on thereference format for the PUSCH, in the subframe that belongs to thesecond subframe set.

Furthermore, in a case where the power headroom for the second subframeset is always reported, the terminal apparatus 1 may report the powerheadroom for the second subframe set that is calculated based on thereference format for the PUSCH, in the subframe that belongs to thefirst subframe set.

Furthermore, in a case where the power headroom is reported, theterminal apparatus 1 may report information that indicates whichsubframe set the power headroom to be reported is for, in a state wherethe information is included in the power headroom reporting.

For example, in a case where the power headroom for the first subframeset is reported, the terminal apparatus 1 may report information thatindicates that the power headroom for the first subframe set isreported, in the state where the information is included in the powerheadroom reporting. Furthermore, in a case where the power headroom forthe second subframe set is reported, the terminal apparatus 1 may reportinformation that indicates that the power headroom for the secondsubframe set is reported, in the state where the information is includedin the power headroom reporting.

For example, the information that indicates which subframe set the powerheadroom to be reported is for may be transmitted using a reserved bitin the first structure or the second structure. That is, in a case ofindicating which subframe set the power headroom to be reported is for,the terminal apparatus 1 may set the reserved bit to a correspondingvalue (for example, a value corresponding to the first subframe set, ora value corresponding to the second subframe set).

A method in which the terminal apparatus 1 reports the power headroomfor each of the multiple subframe sets in a certain single subframe, asis described above, is also referred to below as a first reportingmethod.

Furthermore, the method in which in a certain single subframe, theterminal apparatus 1 reports the power headroom for a certain singlesubframe set is also referred to as a second reporting method. A methodin which the terminal apparatus 1 reports the power headroom for thesubframe set that the subframe performing the power headroom reportingcorresponds to, as described above, is included in the second reportingmethod. Furthermore, a method in which the terminal apparatus 1 alwaysreports which subframe set the power headroom to be reported is for isincluded in the second reporting method.

Here, the base station apparatus 3 may instruct the terminal apparatus 1which of the first reporting method and the second reporting method isused to report the power headroom.

For example, the base station apparatus 3 may instruct the terminalapparatus 1 to report the power headroom using the first reportingmethod, by configuring the multiple subframe sets. Furthermore, the basestation apparatus 3 may instruct the terminal apparatus 1 to report thepower headroom using the first reporting method, by configuring thesecond configuration.

That is, in a case where the multiple subframe sets are configured, theterminal apparatus 1 may report the power headroom using the firstreporting method. Furthermore, in a case where the multiple subframesets are not configured, the terminal apparatus 1 may report the powerheadroom using the second reporting method. The terminal apparatus 1 mayswitch between the first reporting method and the second reportingmethod, based on whether or not the multiple subframe sets areconfigured.

Furthermore, in a case where the second configuration is configured, theterminal apparatus 1 may report the power headroom using the firstreporting method. Furthermore, in a case where the second configurationis not configured (that is, in a case where the first configuration isconfigured without the second configuration being configured), theterminal apparatus 1 may report the power headroom using the secondreporting method. The terminal apparatus 1 may switch between the firstreporting method and the second reporting method, based on whether ornot the second configuration is configured.

Furthermore, the base station apparatus 3 may instruct the terminalapparatus 1 to report the power headroom using the first reportingmethod, by instructing the terminal apparatus 1 to report the powerheadroom using the second configuration (that is, by configuring theparameter (extended-PHR)).

That is, in a case where the parameter (extended-PHR) is configured, theterminal apparatus 1 may report the power headroom using the firstreporting method. Furthermore, in a case where the parameter(extended-PHR) is not configured, the terminal apparatus 1 may reportthe power headroom using the first reporting method. The terminalapparatus 1 may switch between the first reporting method and the secondreporting method, based on whether or not the parameter (extended-PHR)is configured.

Furthermore, the base station apparatus 3 may instruct the terminalapparatus 1 to report the power headroom using the first reportingmethod, by enabling the accumulation in f_(c,setX)(i) for each of thesubframe sets. Here, a method of configuration whether the accumulationin f_(c,setX)(i) for each of the subframe sets is enabled or disabled isas described above.

That is, in a case where the accumulation in f_(c,setX)(i) for each ofthe subframe sets is enabled, the terminal apparatus 1 may report thepower headroom using the first reporting method. That is, in a casewhere the accumulation in f_(c,secX)(i) is performed for each subframeset, the terminal apparatus 1 may report the power headroom for each ofthe multiple subframe sets.

That is, in a case where the accumulation in f_(c,setX)(i) for at leastone subframe set is enabled, the terminal apparatus 1 may report thepower headroom using the first reporting method. That is, in a casewhere the accumulation in f_(c,secX)(i) is performed for at least onesubframe set, the terminal apparatus 1 may report the power headroom foreach of the multiple subframe sets.

Furthermore, in a case where the accumulation in f_(c,setX)(i) for eachof the subframe sets is disabled, the terminal apparatus 1 may reportthe power headroom using the second reporting method. That is, in a casewhere the accumulation in f_(c,setX)(i) is not performed for eachsubframe set, the terminal apparatus 1 may always report the powerheadroom for a single subframe set. That is, in a case where a value off_(c,setX)(i) is set to an absolute value, the terminal apparatus 1 mayalways report the power headroom for a single subframe set.

That is, the terminal apparatus 1 may switch between the first reportingmethod and the second reporting method, based on whether or not theaccumulation in f_(c,setX)(i) is performed for each of the subframesets.

The type-2 power headroom reporting in a case where the parameter(extended-PHR) and the parameter (simultaneousPUCCH-PUSCH) areconfigured is described in detail below. As described above, the type-2power headroom is reported in a case where the parameter (extended-PHR)and the parameter (simultaneousPUCCH-PUSCH) are configured by the basestation apparatus 3.

In this case, even though multiple subframe sets are configured, theterminal apparatus 1 may report a single type-2 power headroom. Forexample, the terminal apparatus 1 may always report the type-2 powerheadroom for the first subframe set. Furthermore, the terminal apparatus1 may always report the type-2 power headroom for the second subframeset.

Here, the base station apparatus 3 may instruct the terminal apparatus 1whether or not the type-2 power headroom for each of the multiplesubframe sets has to be reported. For example, the base stationapparatus 3 may transmit information for instructing the terminalapparatus 1 whether or not the type-2 power headroom for each of themultiple subframe sets has to be reported, using the higher-layersignaling.

Furthermore, the terminal apparatus 1 may always report the type-2 powerheadroom for the subframe set to which the subframe in which thetransmission on the PUCCH is performed belongs. For example, in a casewhere the subframe in which the transmission on the PUCCH is performedalways belongs to the first subframe set, the terminal apparatus 1 mayalways calculate the type-2 power headroom for the first subframe set.Furthermore, in a case where the subframe in which the transmission onthe PUCCH is performed always belongs to the second subframe set, theterminal apparatus 1 may always calculate the type-2 power headroom forthe second subframe set.

Furthermore, the terminal apparatus 1 may calculate the type-2 powerheadroom for the subframe set to which the subframe in which the powerheadroom is reported belongs, and may report the calculated type-2 powerheadroom, in the subframe.

For example, in a case where the subframe set to which the subframe inwhich the power headroom is reported belongs is the first subframe set,the terminal apparatus 1 may calculate the type-2 power headroom for thefirst subframe set and may report the calculated type-2 headroom in thesubframe. Furthermore, in a case where the subframe set to which thesubframe in which the power headroom is reported belongs is the secondsubframe set, the terminal apparatus 1 may calculate the type-2 powerheadroom for the second subframe set and may report the calculatedtype-2 headroom, in the subframe.

A method of reporting the type-1 power headroom and the type-2 powerheadroom is described in detail below. The terminal apparatus 1 canreport the type-1 power headroom and the type-2 power headroom using thereporting methods as described above. That is, the terminal apparatus 1may report the type-1 power headroom and the type-2 power headroom in acombination of some of or all of the reporting methods that aredescribed above.

That is, some of or all of the reporting methods may be applied as amethod of reporting the type-1 power headroom. Furthermore, some of orall of the reporting methods may be applied as a method of reporting thetype-2 power headroom.

For example, the terminal apparatus 1 may report the type-1 powerheadroom for each of the multiple subframe sets and the type-2 powerheadroom for the first subframe set, in a single subframe.

Furthermore, for example, the terminal apparatus 1 may report the type-1power headroom for the subframe set to which the subframe in which thetype-1 power headroom and the type-2 power headroom (that is, the powerheadroom) are reported belongs, and the type-2 power headroom for thefirst subframe set, in the subframe.

Furthermore, for example, the terminal apparatus 1 may report the type-1power headroom for each of the multiple subframe sets and the type-2power headroom for the subframe set to which the subframe in which thetype-2 power headroom is reported belongs, in a single subframe.

Furthermore, for example, the terminal apparatus 1 may report the type-1power headroom and the type-2 power headroom for the subframe set towhich the subframe in which the type-1 power headroom and the type-2power headroom are reported belongs, in the subframe.

Here, the terminal apparatus 1 may report the power headroom for thefirst subframe set and the power headroom for the second subframe set,in different subframes, respectively.

Control of the power headroom reporting will be described in detail.

For example, the reporting of one certain power headroom is triggered ina case where at least one among multiple events that are defined inadvance occurs. For example, the multiple events are defined in advanceby a specification and the like.

For example, the multiple events include an event in which in a casewhere a first time (prohibit-Timer) expires or has expired, pathloss forat least one activated serving cell that is used as a pathloss referenceor for at least one (activated) subframe set that is used as thepathloss reference changes by equal to or more than a set value(dl-pathlossChange) from the moment the last reporting of the powerheadroom is performed when the terminal apparatus 1 is allocated anuplink resource (for example, an UL-SCH resource, or a PUSCH resource)for initialization transmission.

Here, the first timer (prohibit-Timer) may be configured by the basestation apparatus 3, using the higher-layer signaling. Furthermore, thevalue associated with the change in the pathloss (dl-pathlossChange) maybe configured by the base station apparatus 3, using the higher-layersignaling. Furthermore, one cell or one subframe set that is used as thepathloss reference for a certain cell or a certain subframe set may beconfigured by the base station apparatus 3, using the higher-layersignaling.

Furthermore, the multiple events may include an event in which themultiple subframe sets are configured, are reconfigured, or areactivated by the higher layer (using the higher-layer signaling).Furthermore, the multiple events may include an event in which a certainsubframe set is configured, is reconfigured, or is activated by thehigher layer (using the higher-layer signaling).

Here, for example, the base station apparatus 3 may configure thesubframe set using a dedicated message (dedicated signaling) and mayactivate the subframe set that is configured, using the MAC CE (MACsignaling). Here, the terminal apparatus 1 may not monitor thePDCCH/EPDCCH in the subframe that belongs to the deactivated subframeset. Furthermore, the terminal apparatus 1 may not monitor thePDCCH/EPDCCH for the subframe set that belongs to the deactivatedsubframe set.

Furthermore, the multiple events may include an event in which aconfiguration associated with the accumulation in f_(c,setX)(i) ischanged. For example, the multiple events may include an event in whichthe accumulation in f_(c,setX)(i) is changed from a disabled state to anenabled state. Furthermore, for example, the multiple events may includean event in which the accumulation in f_(c,setX)(i) is changed from theenabled state to the disabled state. For example, in a case where theconfiguration associated with the accumulation in f_(c,setX)(i) ischanged, the power headroom reporting may be triggered regardless of thesubframe set.

Furthermore, for example, the terminal apparatus 1 reports the powerheadroom, based on conditions. That is, in a case where the conditionsare satisfied, the terminal apparatus 1 performs the power headroomreporting that is triggered based the events described above.

For example, the conditions include a case where for the correspondingsubframe, the uplink resource (for example, the UL-SCH resource, or thePUSCH resource) for the initialization transmission is allocated, a casewhere the reporting of at least one power headroom is triggered, and acase where the first structure and its subheader or the second structureand its subheader can be accommodated in the uplink resource that isallocated based on logical channel prioritization.

Here, in a case where the parameter (extended-PHR) is configured,multiple subframe sets are configured for a certain cell, and the type-1power headroom is configured to be reported using the first reportingmethod, the terminal apparatus 1 may obtain (calculate) the type-1 powerheadroom for each of the multiple subframe sets. In this case, theparameter (simultaneousPUCCH-PUSCH) is not configured by the basestation apparatus 3.

Furthermore, in a case where the parameter (extended-PHR) is configured,multiple subframe sets are configured for a certain cell, and the type-1power headroom is configured to be reported using the second reportingmethod (that is, the type-1 power headroom is not configured to bereported using the first reporting method), the terminal apparatus 1 mayobtain the type-1 power headroom value for any one subframe set. In thiscase, the parameter (simultaneousPUCCH-PUSCH) is not configured by thebase station apparatus 3.

Furthermore, in a case where the parameter (extended-PHR) is configured,and multiple subframe sets are not configured for a certain cell, theterminal apparatus 1 may acquire a single type-1 power headroom valuefor the certain cell. In this case, the parameter(simultaneousPUCCH-PUSCH) is not configured by the base stationapparatus 3. Furthermore, in this case, the terminal apparatus 1 mayreport the type-1 power headroom using the second reporting method.

That is, in a case where the parameter (extended-PHR) is configured, theterminal apparatus 1 may switch between the obtaining of the powerheadroom for the multiple subframe sets and the obtaining of the powerheadroom for a single subframe set, based whether or not the multiplesubframe sets are configured for a certain cell.

Moreover, in a case where the parameter (extended-PHR) is configured andthe parameter (simultaneousPUCCH-PUSCH) is configured, the terminalapparatus 1 may obtain a type-2 power headroom value.

Furthermore, in a case where the parameter (extended-PHR) is notconfigured, the terminal apparatus 1 may obtain the type-1 powerheadroom value for any one subframe set for the primary cell. In thiscase, the terminal apparatus 1 may report the type-1 power headroomusing the second reporting method.

The terminal apparatus 1 can efficiently execute processing associatedwith the transmission power by executing the transmission power controlas described above. Furthermore, the terminal apparatus 1 canefficiently execute the processing associated with the transmissionpower by reporting the power headroom as described above.

For example, in a system to which the dynamic TDD is applied, theprocessing associated with the transmission power can be efficientlyexecuted. For example, even though the adjacent cell and the servingcell are different in the UL-DL configuration from each other, the basestation apparatus 3 and the terminal apparatus 1 can efficientlycommunicate with each other by efficiently executing the processingassociated with the transmission power.

That is, a terminal apparatus according to the present embodiment is aterminal apparatus configured to communicate with a base stationapparatus. The terminal apparatus includes a transmitting unitconfigured to: in a case that accumulation of power control adjustmentfor each of a plurality of subframe sets is enabled, report to the basestation apparatus in a single subframe, a power headroom for theplurality of subframe sets; and in a case that accumulation of powercontrol adjustment for each of a plurality of subframe sets is disabled,report to the base station apparatus in a single subframe, a powerheadroom for any one of the plurality of subframe sets.

A base station apparatus according to the present invention is a basestation apparatus configured to communicate with a terminal apparatus.The base station apparatus includes a receiving unit configured to: in acase that accumulation of power control adjustment for each of aplurality of subframe sets is enabled, receive from the terminalapparatus in a single subframe, a power headroom for the plurality ofsubframe sets; and in a case that accumulation of power controladjustment for each of the plurality of subframe sets is disabled,receive from the terminal apparatus in a single subframe, a powerheadroom for any one of the plurality of subframe sets

The terminal apparatus 1 and the base station apparatus 3 canefficiently execute the processing associated with the transmissionpower by performing the processing as described above.

A program running on the base station apparatus 3 and the terminalapparatus 1 according to the present invention may be a program (aprogram for causing a computer to operate) that controls a CentralProcessing Unit (CPU) and the like in such a manner as to realize thefunctions according to the embodiment of the present invention, whichare described above. Then, the information that is handled in theseapparatuses is temporarily stored in a Random Access Memory (RAM) whilebeing processed. Thereafter, the information is stored in various typesof ROM such as a Flash Read Only Memory (ROM) or a Hard Disk Drive (HDD)and, whenever necessary, is read by the CPU to be modified or rewritten.

Moreover, one portion of the terminal apparatus 1 and the base stationapparatus 3 according to the embodiments, which are described above maybe realized by the computer. In that case, the one portion may berealized by recording a program for realizing such control functions ona computer-readable medium and causing a computer system to read theprogram stored on the recording medium for execution.

Moreover, the “computer system” here is defined as a computer systembuilt into the terminal apparatus 1 or the base station apparatus 3 andas including an OS or hardware components such as a peripheral device.Furthermore, the “computer-readable recording medium” refers to aportable medium such as a flexible disk, a magneto-optical disk, a ROM,and a CD-ROM, and a storage device such as a hard disk that is builtinto the computer system.

Moreover, the “computer-readable recording media” may include a mediumthat dynamically retains the program for a short period of time, such asa communication line that is used when transmitting the program over anetwork such as the Internet or over a communication circuit such as atelephone circuit and a medium that retains the program for a constantperiod of time, such as a volatile memory within the computer system,which functions as a server or a client in a case of including theprogram dynamically. Furthermore, the program may be one for realizingsome of the functions described above and additionally may be one thatcan realize the functions described above in combination with a programthat is already recorded on the computer system.

Furthermore, the base station apparatus 3 according to the embodiment,which is described, can be realized as an aggregation (an apparatusgroup) that is configured from multiple apparatuses. Each apparatus thatmakes up the apparatus group may be equipped with some portion of or allportions of each function or each functional block of the base stationapparatus 3 according to the embodiment, which is described. Theapparatus group itself may have each general function or each generalfunctional block of the base station apparatus 3. Furthermore, theterminal apparatus 1 according to the embodiment, which is described,can also communicate with the base station apparatus as the aggregation.

Furthermore, the base station apparatus 3 according to the embodiment,which is described, may be also referred to as an Evolved UniversalTerrestrial Radio Access Network (E-UTRAN). Furthermore, the basestation apparatus 3 according to the embodiment, which is described, mayhave some portions of or all portions of a function of a higher nodeabove an eNodeB.

Furthermore, some portions of or all portions of the terminal apparatus1 and the base station apparatus 3 according to the embodiment, which isdescribed, may be realized as an LSI that is a typical integratedcircuit and be realized as a chip set. Each functional block of theterminal apparatus 1 and the base station apparatus 3 may beindividually realized as a chip, and some of, or all of the functionalblocks may be integrated into a chip. Furthermore, a circuit integrationtechnique is not limited to the LSI, and an integrated circuit for thefunctional block may be realized with a dedicated circuit or ageneral-purpose processor. Furthermore, if with advances in asemiconductor technology, a circuit integration technology that replacesthe LSI appears, it is also possible to use an integrated circuit towhich such a technology is applied.

Furthermore, according to the embodiment, as described above, a terminalapparatus or a communication apparatus is provided as one example, butthe present invention is not limited to this, and can be applied also toa terminal apparatus or a communication apparatus, such as a fixed-typeelectronic apparatus that is installed indoors or outdoors, or astationary-type electronic apparatus, for example, an AV apparatus, akitchen apparatus, a cleaning or washing machine, an air-conditioningapparatus, an office apparatus, a vending machine, and other householdapparatuses.

Furthermore, the terminal apparatus may collectively refer to amobile-type or fixed-type user equipment, such as User Equipment (UE), aMobile Station (MS), a mobile station apparatus, a mobile terminal(Mobile Terminal (MT)), a subscriber unit, a subscriber station, awireless terminal, a mobile device, a node, a device, a remote station,a remote terminal, a wireless communication device, a wirelesscommunication apparatus, a user agent, and an access terminal.

Furthermore, the base station apparatus may collectively refer to anarbitrary node on a network terminal that communicates with theterminal, such as a NodeB, an enhanced NodeB (eNodeB), a base station,and an Access Point (AP). Moreover, the base station apparatus mayinclude a Remote Radio Head (RRH) (which is also referred to as RemoteRadio Unit (RRU), a remote antenna, or a distributed antenna).

The embodiments of the invention are described in detail above referringto the drawings, but the specific configuration is not limited to theembodiments and includes an amendment to a design that falls within ascope not deviating from the gist of the present invention. Furthermore,various modifications are possible within the scope of the presentinvention defined by claims, and embodiments that are made by suitablycombining technical means disclosed according to the differentembodiments are also included in the technical scope of the presentinvention. Furthermore, a configuration in which a constituent elementthat achieves the same effect is substituted for the one that ismentioned according to each of the embodiments is also included in thetechnical scope of the present invention.

INDUSTRIAL APPLICABILITY

An embodiment of the present invention is applicable to a terminalapparatus, a base station apparatus, a communication method, and anintegrated circuit, which are required to efficiently perform a processrelated to a transmission power.

DESCRIPTION OF REFERENCE NUMERALS

-   -   1 (1A, 1B, 1C) TERMINAL APPARATUS    -   3 BASE STATION APPARATUS    -   101 HIGHER-LAYER PROCESSING UNIT    -   103 CONTROL UNIT    -   105 RECEIVING UNIT    -   107 TRANSMITTING UNIT    -   109 TRANSMISSION POWER PROCESSING UNIT    -   301 HIGHER-LAYER PROCESSING UNIT    -   303 CONTROL UNIT    -   305 RECEIVING UNIT    -   307 TRANSMITTING UNIT    -   1011 RADIO RESOURCE CONTROL UNIT    -   1013 SUBFRAME SETTING UNIT    -   1015 SCHEDULING INFORMATION INTERPRETATION UNIT    -   1017 TRANSMISSION POWER CONTROL UNIT    -   3011 RADIO RESOURCE CONTROL UNIT    -   3013 SUBFRAME SETTING UNIT    -   3015 SCHEDULING UNIT    -   3017 TRANSMISSION POWER CONTROL UNIT

The invention claimed is:
 1. A terminal apparatus that communicates witha base station apparatus, the terminal apparatus comprising: receptioncircuitry that receives, using a higher layer signal, informationindicating whether a subframe belongs to a first subframe set or asecond subframe set; processing circuitry that: computes a powerheadroom indicating a first difference between a maximum transmissionpower for a serving cell and a first estimated power for the servingcell using a first set of parameters, for the subframe for a servingcell, based on a reference format, in a case that the subframe belongsto the first subframe set, and transmission on a physical uplink sharedchannel is not performed in the subframe for the serving cell; computesthe power headroom indicating a second difference between the maximumtransmission power for the serving cell and a second estimated power forthe serving cell using a second set of parameters, based on thereference format, in a case that the subframe belongs to the secondsubframe set, and the transmission on the physical uplink shared channelis not performed in the subframe for the serving cell; and reportingcircuitry that reports the power headroom to the base station apparatus;wherein the first set of parameters includes a first parameter and asecond parameter, the second set of parameters includes a thirdparameter and a fourth parameter, the first parameter is a coefficientto be multiplied with a pathloss, the third parameter is a coefficientto be multiplied with the pathloss, and each of the second and fourthparameters is given by a fifth parameter indicating whether accumulationfor the second and fourth parameters is enabled or disabled.
 2. A basestation apparatus that communicates with a terminal apparatus, the basestation apparatus comprising: transmission circuitry that transmits,using a higher layer signal, information indicating whether a subframebelongs to a first subframe set or a second subframe set; and receptioncircuitry that receives a power headroom; wherein the power headroomindicates a first difference between a maximum transmission power for aserving cell and a first estimated power for the serving cell computedby the terminal apparatus using a first set of parameters, for thesubframe for a serving cell, based on a reference format, in a case thatthe subframe belongs to the first subframe set, and transmission on aphysical uplink shared channel is not performed in the subframe for theserving cell; the power headroom indicates a second difference betweenthe maximum transmission power for the serving cell and a secondestimated power for the serving cell computed by the terminal apparatususing a second set of parameters, based on the reference format, in acase that the subframe belongs to the second subframe set, and thetransmission on the physical uplink shared channel is not performed inthe subframe for the serving cell; the first set of parameters includesa first parameter and a second parameter, the second set of parametersincludes a third parameter and a fourth parameter, the first parameteris a coefficient to be multiplied with a pathloss, the third parameteris a coefficient to be multiplied with the pathloss, and each of thesecond and fourth parameters is given by a fifth parameter indicatingwhether accumulation for the second and fourth parameters is enabled ordisabled.
 3. A communication method for a terminal apparatus thatcommunicates with a base station apparatus, the communication methodcomprising: receiving, using a higher layer signal, informationindicating whether a subframe belongs to a first subframe set or asecond subframe set; computing a power headroom indicating a firstdifference between a maximum transmission power for a serving cell and afirst estimated power for the serving cell computed using a first set ofparameters, for the subframe for a serving cell, based on a referenceformat, in a case that the subframe belongs to the first subframe set,and transmission on a physical uplink shared channel is not performed inthe subframe for the serving cell; computing the power headroomindicating a second difference between the maximum transmission powerfor the serving cell and a second estimated power computed for theserving cell using a second set of parameters, based on the referenceformat, in a case that the subframe belongs to the second subframe set,and the transmission on the physical uplink shared channel is notperformed in the subframe for the serving cell; and reporting the powerheadroom to the base station apparatus; wherein the first set ofparameters includes a first parameter and a second parameter, the secondset of parameters includes a third parameter and a fourth parameter, thefirst parameter is a coefficient to be multiplied with a pathloss, thethird parameter is a coefficient to be multiplied with the pathloss, andeach of the second and fourth parameters is given by a fifth parameterindicating whether accumulation for the second and fourth parameters isenabled or disabled.
 4. A communication method for a base stationapparatus that communicates with a terminal apparatus, the communicationmethod comprising: transmitting, using a higher layer signal,information indicating whether a subframe belongs to a first subframeset or a second subframe set; and receiving a power headroom; whereinthe power headroom indicates a first difference between a maximumtransmission power for a serving cell and a first estimated power forthe serving cell computed by the terminal apparatus using a first set ofparameters, for the subframe for a serving cell, based on a referenceformat, in a case that the subframe belongs to the first subframe set,and transmission on a physical uplink shared channel is not performed inthe subframe for the serving cell; the power headroom indicates a seconddifference between the maximum transmission power for the serving celland a second estimated power for the serving cell computed by theterminal apparatus using a second set of parameters, based on thereference format, in a case that the subframe belongs to the secondsubframe set, and the transmission on the physical uplink shared channelis not performed in the subframe for the serving cell; the first set ofparameters includes a first parameter and a second parameter, the secondset of parameters includes a third parameter and a fourth parameter, thefirst parameter is a coefficient to be multiplied with a pathloss, thethird parameter is a coefficient to be multiplied with the pathloss, andeach of the second and fourth parameters is given by a fifth parameterindicating whether accumulation for the second and fourth parameters isenabled or disabled.